Ranked by: number of candidates
1.
To / in order to / so as to / so that (222514 candidates)
2.
Could, should and would (43381 candidates)
3.
Personal pronouns (28223 candidates)
4.
Direct/Reported Speech (15093 candidates) 
5.
Say, Speak or Tell (13213 candidates)
6.
Modal verbs (12497 candidates)
7.
Compound words with some,any,no (11766 candidates)
8.
Subordinating conjunctions (9008 candidates)
9.
Gerund or infinitive (8130 candidates)
10.
Do or Make (8067 candidates) 
11.
Relative pronouns (6021 candidates)
12.
Agreement tags (5499 candidates)
13.
Assure / ensure / insure (4517 candidates) 
14.
Various tenses in the present (4487 candidates) 
15.
Connectives (4156 candidates)
16.
Prepositions and conjunctions (3849 candidates)
17.
Express quantities (3405 candidates)
18.
Passive form (2882 candidates)
19.
Good or Well (2496 candidates) 
20.
Phrasal verbs (1889 candidates) 
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