In the English Grammar Profile, C1 point 59 in the category of ADVERBS/phrases is defined as:
an increasing range of degree adverbs to modify a range of adverb types.
*this is unclear in the EGP because we are not sure whether only their examples that are doing the modifying are to be C1.
We can look at their examples in iWeb:
almost|quite|incredibly|reasonably _RR
1 QUITE A 128584
2 ALMOST ALWAYS
124188
PELIC STUDENT examples:
Every day after finishing school, she almost always practiced dancing with loud music.
Korean Female level 5 writing
Companies almost always determine their actions in order to profit targets, because they always try to get more customers.
Russian Female level 5 writing
3 ALMOST CERTAINLY 67338
4 QUITE WELL 58405
5 QUITE OFTEN 43006
6 ALMOST IMMEDIATELY 39788
7 ALMOST ENTIRELY 36699
8 ALMOST NEVER 33202
9 ALMOST EXCLUSIVELY 27701
10 ALMOST COMPLETELY 24554
11 QUITE SIMPLY
23341
He wanted to create, quite simply, the biggest mixed martial arts spectacle in history.
12 QUITE FRANKLY 22006 (this grammar is often called ‘comment adverbials’)
This let us build a model of my face that, quite frankly, is just amazing.
13 QUITE POSSIBLY 20916
14 QUITE LITERALLY 19742
15 ALMOST EXACTLY
18849
The graph indicates that they were almost exactly the same in 2004.
Korean Female B1
16 QUITE EASILY 17754
17 ALMOST INSTANTLY 12506
18 QUITE RIGHT 12436
19 QUITE QUICKLY 11661
20 REASONABLY WELL 11087
21 QUITE NICELY 9869
22 ALMOST TWICE 9854
23 INCREDIBLY WELL 9837
24 QUITE ENOUGH 8092
25 QUITE CLEARLY 7973
26 QUITE YET 7796
27 QUITE HONESTLY 6482
28 ALMOST UNIVERSALLY 6214
29 QUITE FREQUENTLY 6170
30 QUITE AWHILE 5703
31 ALMOST DAILY 5479
32 QUITE RIGHTLY 4629
33 ALMOST INVARIABLY 4493
34 ALMOST TOTALLY 4458
35 QUITE FAR 4264
36 ALMOST PERFECTLY 4098
37 QUITE DIFFERENTLY 3764
38 QUITE FAST 3528
39 QUITE RECENTLY 3522
40 QUITE OBVIOUSLY 3340
41 QUITE HAPPILY 3179
42 QUITE HARD 2917
43 ALMOST CONSTANTLY 2904
44 QUITE CLOSE 2887
45 QUITE SO 2855
46 QUITE EARLY 2836
47 ALMOST HALF 2818
48 ALMOST DEFINITELY 2793
49 QUITE LONG 2756
50 ALMOST FULLY 2659
51 QUITE NATURALLY 2560
52 ALMOST DIRECTLY 2447
53 QUITE HOW 2330
54 INCREDIBLY FAST 2319
55 ALMOST ALL 2309
56 ALMOST SURELY 2288
57 QUITE REGULARLY 2241
58 ALMOST EQUALLY 2213
59 QUITE RAPIDLY 2211
60 ALMOST INSTANTANEOUSLY 2194
61 QUITE SOON 2100
62 ALMOST LITERALLY 2054
63 QUITE AS 2032
64 ALMOST INEVITABLY 1995
65 QUITE HEAVILY 1900
66 QUITE BADLY 1895
67 ALMOST RIGHT 1874
68 ALMOST SIMULTANEOUSLY 1839
69 ALMOST STRAIGHT 1832
70 ALMOST SOLELY 1786
71 QUITE LIKELY 1771
72 ALMOST SINGLE-HANDEDLY 1702
73 QUITE SIGNIFICANTLY 1679
74 INCREDIBLY HARD 1660
75 ALMOST WHOLLY 1654
76 QUITE EFFECTIVELY 1649
77 QUITE SERIOUSLY 1648
78 ALMOST JUST 1531
79 QUITE DRAMATICALLY 1531
80 QUITE LATE 1510
81 QUITE CLOSELY 1372
82 QUITE COMFORTABLY 1372
83 QUITE STRONGLY 1371
84 QUITE SUCCESSFULLY 1343
85 QUITE LOUD 1337
86 ALMOST ENOUGH 1331
87 QUITE SUDDENLY 1260
88 ALMOST CONTINUOUSLY 1258
89 QUITE REASONABLY 1257
90 QUITE DEEP 1219
91 ALMOST UNANIMOUSLY 1205
92 QUITE PROBABLY 1204
93 QUITE LIKE 1173
94 ALMOST AT 1141
95 INCREDIBLY QUICKLY 1127
96 ALMOST ASSUREDLY 1122
97 QUITE EXTENSIVELY 1078
98 ALMOST AUTOMATICALLY 1052
99 QUITE TIGHT 1036
100 QUITE SLOWLY 1021