ought (semi modal)

A search for ‘ought’ on the EGP shows that it is used from B1-C2 across 12 points.  Most can be differentiated formally, while the following 4 points will require manual interpretation to get the right level:

Point 190 in Modality is C1 and is used to talk about something which is likely.

B2 in Modality is desired states

B1 in Modality is simply affirmative. 

B1 in Verbs is semi-modals.

The others are formally found here:

All of them together are the 12 in the English Grammar Profile as such:

 

5 spaces left and right on iWeb corpus:

1 THEREFORE (RR ) 2322
2 OUGHT (VMK ) 1009

3 PRAY (VVI ) 793

4 CHRISTIANS (NN2 ) 693

5 ASHAMED (JJ ) 692

6 REASONABLY (RR ) 665
7 YE (PPY ) 568
8 SURELY (RR ) 550
9 THINKS (VVZ ) 547
10 OBEY (VVI ) 458
11 BEHAVE (VVI ) 364
12 REGARDED (VVN ) 288
13 LIKEWISE (RR ) 260
14 PUNISHED (VVN ) 256
15 AVOIDED (VVN ) 215
16 MORALLY (RR ) 171
17 BELIEVERS (NN2 ) 169
18 THANKFUL (JJ ) 169
19 GOVERN (VVI ) 166
20 IMPLIES (VVZ ) 166