Ranked by: number of candidates
1.
Verb + to infinitive (5688 candidates) 
2.
Past simple, continuous or perfect (2763 candidates) 

3.
Have - has in present simple (2001 candidates)
4.
Like or would like to (1748 candidates)
5.
Have - ordinary verb (1609 candidates) 
6.
Quantity: a lot of- much- many- a little- a few- some- a- an (1604 candidates) 
7.
Do/does/am/is/are (1511 candidates)
8.
Present simple/ questions do... does (1420 candidates)
9.
Short answers - verb to be in present (1415 candidates) 
10.
Him/her/them... (1317 candidates)
11.
Be going to (1302 candidates)
12.
Advice:If I were you + two word verbs (1250 candidates) 

13.
Present perfect: ever/yet/ already (1163 candidates) 
14.
It's the first time + present perfect (1137 candidates) 
15.
Say or tell (1107 candidates) 
16.
Quantifiers: a little/ a few/ a lot (1106 candidates) 
17.
Present simple: short answers (1045 candidates)
18.
Was/were/ wasn't/ weren't (1023 candidates)
19.
Do you like..? Does he like..? (1009 candidates)
20.
How much - how many - a lot of (978 candidates) 
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