Most reporting or mental processing constructions that introduce object clauses are listed at A2 or B1 in the English Grammar Profile. We believe that if adverbs are also included, this probably shows B2 ability. To check this, we look in the TLC speaking tests and find that the most common example only starts being used at B2:
I just think that everything is going to be alright.
female Argentina B2
I just think that pets are useful.
female China B2
A search in COCA for:
_P _RR _VV _CST
1 I JUST THINK THAT 1128
2 I ALSO THINK THAT 1020
3 YOU REALLY THINK THAT 776
4 I ALSO KNOW THAT 741
5 WE ALSO KNOW THAT 740
6 HE ALSO SAID THAT 694
7 I ALSO BELIEVE THAT 613
8 I REALLY THINK THAT 572
9 I ALWAYS THOUGHT THAT 525
10 I JUST KNOW THAT 485
11 IT ALSO MEANS THAT 462
12 I NEVER THOUGHT THAT 404
13 I REALLY BELIEVE THAT 383
14 I TRULY BELIEVE THAT 368
15 IT JUST MEANS THAT 350
16 I STILL THINK THAT 345
17 YOU REALLY BELIEVE THAT 344
18 I FIRMLY BELIEVE THAT 336
19 ME JUST SAY THAT 336
20 I REALLY HOPE THAT 271
21 I STILL BELIEVE THAT 264
22 I NEVER SAID THAT 261
23 I JUST THOUGHT THAT 253
24 I JUST KNEW THAT 237
25 WE ALREADY KNOW THAT 236
26 I ALSO AGREE THAT 222
27 I ACTUALLY THINK THAT 219
28 I SINCERELY HOPE THAT 213
29 I JUST HOPE THAT 207
30 I ALSO KNEW THAT 206
31 YOU EVER THINK THAT 203
32 I JUST FEEL THAT 202
33 I PERSONALLY THINK THAT 195
34 I ALWAYS KNEW THAT 192
35 HE ALSO NOTED THAT 191
36 WE ALSO FOUND THAT 191
37 I SERIOUSLY DOUBT THAT 190
38 I JUST SAID THAT 187
39 HE ALSO SAYS THAT 186
40 I PERSONALLY BELIEVE THAT 181
41 I STRONGLY BELIEVE THAT 181
42 I ONLY HOPE THAT 180 ‘THAT‘ is optional.
And I only hope you find the father of this baby,
because I sincerely doubt that I‘m responsible.
43 I BOTH KNOW THAT 179
44 I ALWAYS FELT THAT 177
45 I ALSO UNDERSTAND THAT 170
46 I NEVER KNEW THAT 169
47 YOU ALREADY KNOW THAT 169
48 HE ALSO KNEW THAT 167
49 SHE ALSO SAID THAT 167
50 I REALLY THOUGHT THAT 165
51 I REALLY FEEL THAT 163
52 THEY ALSO FOUND THAT 163
53 YOU JUST SAID THAT 154
54 I JUST FELT THAT 149
55 WE ALSO BELIEVE THAT 148
56 I ALSO FEEL THAT 146
57 I JUST SAY THAT 145
58 THEY ALSO SAY THAT 145
59 THEY ALSO KNOW THAT 143
60 I HONESTLY BELIEVE THAT 142
61 YOU ALSO KNOW THAT 142
62 IT ALSO SHOWS THAT 138
63 I JUST ASSUMED THAT 136
64 I ALWAYS SAY THAT 135
65 I ALSO HOPE THAT 133
66 I CERTAINLY HOPE THAT 133
67 HE ALSO KNOWS THAT 131
68 I JUST REALIZED THAT 128
69 I ONLY KNOW THAT 127
I only know that the man you‘re looking at cares a lot about this job.
70 THEY ALSO SAID THAT 127
71 I COMPLETELY AGREE THAT 121
72 I ALSO LEARNED THAT 120
73 IT SIMPLY MEANS THAT 119
74 IT JUST SEEMS THAT 116
75 I FINALLY REALIZED THAT 114
76 IT ALSO SUGGESTS THAT 112
77 YOU PROBABLY KNOW THAT 111
78 I TOTALLY AGREE THAT 110
79 HE ALSO NOTES THAT 109
80 YOU HONESTLY BELIEVE THAT 108
81 IT SO HAPPENS THAT 107
82 I SUDDENLY REALIZED THAT 106
83 IT ALSO SAYS THAT 106
84 I CERTAINLY THINK THAT 102
85 SHE ALSO KNEW THAT 101
86 I HONESTLY THINK THAT 99
87 I ALSO NOTICED THAT 98
88 I DEFINITELY THINK THAT 98
89 I ONLY WISH THAT 96 *notice this is followed by PAST tenses
I only wish that you had met Frank and known him personally.
90 YOU JUST KNOW THAT 96
91 I STILL FEEL THAT 95
92 IT ALSO APPEARS THAT 92
93 THEY ALSO BELIEVE THAT 90
94 I HIGHLY DOUBT THAT 88
95 YOU EVER NOTICED THAT 88
96 I JUST MEANT THAT 85
97 I NEVER IMAGINED THAT 84
98 YOU HONESTLY THINK THAT 84
99 I ALSO THOUGHT THAT 83
100 I REALLY WISH THAT 83
B2 vocabulary:
assumed, firmly, highly, simply, strongly, truly