Ranked by: number of candidates
1.
Future with shall and will (87409 candidates)
2.
About To be and To have (61188 candidates)
3.
Personal pronouns (38461 candidates)
4.
Possessive case (28427 candidates) 
5.
Who and Which (28111 candidates)
6.
Past perfect simple (24162 candidates)
7.
How many - How much (23487 candidates)
8.
Comparison (22001 candidates) 
9.
Present simple or continuous (20433 candidates)
10.
Exclamations with How or What (17676 candidates)
11.
Any - some - no (16409 candidates)
12.
Too many or too much (12495 candidates)
13.
Superlatives (12477 candidates)
14.
Another - other - the others (12015 candidates)
15.
If or When (11879 candidates)
16.
Conditional present (11815 candidates) 
17.
Relative pronouns Who or Which (11486 candidates)
18.
Past simple (10988 candidates)
19.
Prefixes Over and Under (10562 candidates) 
20.
How long - For - Since (10238 candidates)
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