1 eat
2 ate
3 are ... eating
4 did ... eat
5 will ...eat
6 is... eating, will be eating
7 Have ... eaten
8 eats
9 have ... eaten
10 did... eat
11 eat
12 is eating
13 eats
14 eat
15 eats
16 has... eaten
17 have... eaten
18 had ... eaten
19 will eat
20 do... eat