At A2 in the Oxford Learner’s Dictionary:

a bit [singular] (used as an adverb) (especially British English) = rather; to some extent

Here are comparative examples:

You might need a bit more than that.

Is that everything? I mean, it seemed like he said quite a bit more than that.

Listen

 

Now, let’s explain an expert example of the C1 grammar structure: ‘a bit’ + comparative adjective phrase.  

Remember that adjectives are often premodified by adverb phrases. Usually, the premodifier is an intensifier.  For example, ‘very good‘ or ‘much better‘.  The adverb ‘very’ intensifies the adjective ‘good’.   (‘Very‘ cannot intensify comparative adjectives.)  ‘Much‘ intensifies the comparative adjective: ‘better‘.

We’ll start with a comparative adjective ‘more complicated‘  as a subject complement at A2 grammar:

• Reality is more complicated.

‘a bit‘ is an advanced C1 adverbial phrase that can change the meaning of the comparative adjective to a small degree.

• Reality is a bit more complicated than this.                                        (Listen to this sentence)

There are other adverbs of degree that can grade like this too:

• Reality is slightly more complicated than this. (the same meaning as ‘a bit‘ but formal)
• Reality is much more complicated than this.  (the opposite meaning to ‘slightly‘)
• Reality is so much more complicated than this.  (‘so‘ makes ‘much‘ stronger.)

But we can also follow the comparative phrase with a noun:

•  It was a much more complicated process…                                                  (gametz.com)

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The reason we give different colours is because we are trying to understand what Cambridge says about C1 B2 B1 grammar differences.  This post will attempt to untangle another set of grammar features that are clashing across levels.  The centre of the confusion starts with:

C1 Point 63 in the category of ADVERB phrases which is defined as:

degree adverbs (‘slightly‘, ‘a bit‘, ‘much‘) to modify comparatives.

But it clashes completely with B2 Point 57 in the category of  adjectives in the English Grammar Profile which is defined by the adverb:

‘SLIGHTLY‘ to modify comparative adjectives to a small degree.

And point 63 in ADJECTIVES and comparatives is B2:

‘much’ to modify and intensify comparative adjectives used attributively before countable and uncountable nouns

*Attributive means that the adjective comes right in front of the noun that it is describing.  That means there is no verb between!

And also with Point 38 in Adjectives at B1

‘(SO) MUCH‘ to modify and intensify comparative adjectives used predicatively after a verb, usually ‘be’.

And it clashes with B1 point 50 in Adjectives.

1 MUCH BETTER 228880

I am feeling much better.

listen

2 MUCH EASIER 154455
3 MUCH HIGHER 102692
4 MUCH LARGER 80028
5 MUCH SMALLER 57891
6 MUCH LOWER 56964
7 MUCH BIGGER 47903
8 MUCH GREATER 46174
9 MUCH WORSE 38804
10 MUCH CHEAPER 34587
11 MUCH HARDER 34295
12 MUCH LONGER 34011
13 MUCH STRONGER 26886
14 MUCH FASTER 23810
15 MUCH SIMPLER 21574
16 MUCH SHORTER 15294
17 MUCH WIDER 15259
18 MUCH OLDER 15034
19 MUCH CLOSER 13913
20 MUCH NICER 13913
21 MUCH HAPPIER 11891
22 MUCH LIGHTER 10944
23 MUCH YOUNGER 10803
24 MUCH BROADER 10142
25 MUCH SMOOTHER 9104
26 MUCH CLEARER 7861
27 MUCH HEALTHIER 7770
28 MUCH SLOWER 7360
29 MUCH SAFER 7358
30 MUCH DEEPER 7156
31 MUCH QUICKER 6950
32 MUCH HEAVIER 6128
33 MUCH CLEANER 5920
34 MUCH DARKER 5776

35 MUCH TOUGHER 5685

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1 MUCH MORE LIKELY 29496
2 MUCH MORE DIFFICULT 24447
3 MUCH MORE EXPENSIVE 15295
4 MUCH MORE IMPORTANT 13773

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5 MUCH MORE EFFECTIVE 11220

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6 MUCH MORE EFFICIENT 10618
7 MUCH MORE COMFORTABLE 10445
8 MUCH MORE INTERESTING 9141
9 MUCH MORE POWERFUL 9121
10 MUCH MORE COMMON 8090

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11 MUCH MORE COMPLICATED 7274 + _NN

1 MUCH MORE COMPLICATED PROCESS 72
2 MUCH MORE COMPLICATED STORY 29
3 MUCH MORE COMPLICATED TASK 29
4 MUCH MORE COMPLICATED PICTURE 24
5 MUCH MORE COMPLICATED ISSUE 23

12 MUCH MORE COMPLEX 6692

13 MUCH MORE ENJOYABLE 6236
14 MUCH MORE AFFORDABLE 4890
15 MUCH MORE CONVENIENT 4786
16 MUCH MORE SERIOUS 4718
17 MUCH MORE USEFUL 4706
18 MUCH MORE ACCURATE 4523
19 MUCH MORE VALUABLE 3460
20 MUCH MORE STABLE 3211
21 MUCH MORE FLEXIBLE 3185
22 MUCH MORE CONFIDENT 3118
23 MUCH MORE FUN 3098
24 MUCH MORE RELIABLE 3046
25 MUCH MORE ATTRACTIVE 2984
26 MUCH MORE DETAILED 2911
27 MUCH MORE DANGEROUS 2903
28 MUCH MORE PLEASANT 2768
29 MUCH MORE INTERESTED 2747
30 MUCH MORE PRODUCTIVE 2741
31 MUCH MORE SOPHISTICATED 2698
32 MUCH MORE EXCITING 2561
33 MUCH MORE MANAGEABLE 2529
34 MUCH MORE REALISTIC 2498
35 MUCH MORE POPULAR 2428
36 MUCH MORE RELAXED 2401
37 MUCH MORE SUCCESSFUL 2381
38 MUCH MORE CHALLENGING 2336
39 MUCH MORE OPEN 2305
40 MUCH MORE APPEALING 2211
41 MUCH MORE NATURAL 2171
42 MUCH MORE AGGRESSIVE 2114
43 MUCH MORE SIGNIFICANT 2113
44 MUCH MORE SECURE 2100
45 MUCH MORE ACCESSIBLE 2093
46 MUCH MORE POSITIVE 2090
47 MUCH MORE SENSITIVE 2043

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a bit more _jj

1 A BIT MORE COMPLICATED 5619
2 A BIT MORE EXPENSIVE 4736
3 A BIT MORE DIFFICULT 4397

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4 A BIT MORE COMPLEX 2844

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5 A BIT MORE CHALLENGING 1863
6 A BIT MORE INTERESTING 1759
7 A BIT MORE FUN 1187
8 A BIT MORE COMFORTABLE 1150
9 A BIT MORE SPECIFIC 900
10 A BIT MORE TRICKY 792
11 A BIT MORE SERIOUS 713
12 A BIT MORE ADVANCED 678
13 A BIT MORE CREATIVE 671
14 A BIT MORE AGGRESSIVE 667
15 A BIT MORE FLEXIBLE 667
16 A BIT MORE RELAXED 617
17 A BIT MORE SUBTLE 569
18 A BIT MORE CAREFUL 532
19 A BIT MORE ADVENTUROUS 515
20 A BIT MORE CLEAR 509
21 A BIT MORE REALISTIC 499
22 A BIT MORE SPECIAL 493
23 A BIT MORE MODERN 490
24 A BIT MORE POWERFUL 483
25 A BIT MORE SOPHISTICATED 480
26 A BIT MORE EXCITING 476
27 A BIT MORE STABLE 426
28 A BIT MORE TECHNICAL 422
29 A BIT MORE OPEN 412
30 A BIT MORE CONFIDENT 404
31 A BIT MORE FORGIVING 393
32 A BIT MORE AFFORDABLE 383
33 A BIT MORE ROBUST 382
34 A BIT MORE PERSONAL 381
35 A BIT MORE INVOLVED 379
36 A BIT MORE ACCURATE 378
37 A BIT MORE ACTIVE 365
38 A BIT MORE UNIQUE 364
39 A BIT MORE DETAILED 360
40 A BIT MORE SUBSTANTIAL 337
41 A BIT MORE EFFICIENT 332
42 A BIT MORE CASUAL 326
43 A BIT MORE MANAGEABLE 324
44 A BIT MORE REFINED 314
45 A BIT MORE CAUTIOUS 313
46 A BIT MORE USEFUL 313
47 A BIT MORE NATURAL 303
48 A BIT MORE CONSERVATIVE 301
49 A BIT MORE LIGHT 297
50 A BIT MORE PRICEY 293

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1 A BIT HIGHER 8891

2 A BIT SMALLER 6170
3 A BIT EASIER 5530
4 A BIT BIGGER 5494
5 A BIT LONGER 5068
6 A BIT LOWER 4935
7 A BIT LARGER 4860
8 A BIT OLDER 4822
9 A BIT HARDER 4066
10 A BIT CHEAPER 3448
11 A BIT BETTER 2967
12 A BIT LIGHTER 2782
13 A BIT SHORTER 2737
14 A BIT HEAVIER 2569

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15 A BIT TRICKIER 2549

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16 A BIT THICKER 2475
17 A BIT DARKER 2372
18 A BIT STRONGER 2269
19 A BIT WIDER 2252
20 A BIT TOUGHER 1678
21 A BIT WORSE 1604
22 A BIT WARMER 1559
23 A BIT TALLER 1520
24 A BIT SOFTER 1478
25 A BIT COOLER 1442
26 A BIT BRIGHTER 1319
27 A BIT CLEARER 1143
28 A BIT THINNER 1139
29 A BIT SIMPLER 1136
30 A BIT YOUNGER 1113
31 A BIT LOUDER 1071
32 A BIT SMOOTHER 1064
33 A BIT NICER 1049
34 A BIT TIGHTER 1047
35 A BIT QUIETER 836
36 A BIT PRICIER 757
37 A BIT SWEETER 709
38 A BIT WEAKER 682
39 A BIT CLEANER 639
40 A BIT SMARTER 583
41 A BIT HEALTHIER 579
42 A BIT STIFFER 565

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This is covered elsewhere:

1 SLIGHTY BETTER 44
2 SLIGHTY HIGHER 35
3 SLIGHTY LARGER 32
4 SLIGHTY LOWER 18
5 SLIGHTY BIGGER 17
6 SLIGHTY SMALLER 15
7 SLIGHTY LONGER 12
8 SLIGHTY DARKER 12
9 SLIGHTY FASTER 11
10 SLIGHTY SHORTER 10

1 SLIGHTY MORE EXPENSIVE 8
2 SLIGHTY MORE POWERFUL 4