Right form of verbs, (1st class)

                                     

Places of base form of verb are given below:

1. After Modal verb,  verb should be base form.

2. After do not, does not & did not, verb should be base form.

3. After 'have to' 'has to '& 'had to ', verb should be base form

4. After 'used to', verb should be base form.

5. After 'had better ' & 'would rather ', verb should base form.

6. After 'am to, is to, are to, was to, & were to, verb should be base form.