- Tom doesn't have to wash the car ( ko dùng 'has' vì đây là thể phủ định )

- Lisa and Tom have to do homework. ( CN là Lisa và Tom là 2 người )

- Tom doesn't have to walk the dog. ( với CN là 'he' 'she' 'it' dùng does -does not)

- Lisa has to study history ( với CN là " he " " she " "it " thì dùng has bạn nhé )

- Tom has to study history ( tương tự nwhu câu trên )
- Lisa and Tom don't have to set the table.

- Tom has to cut the grass.

- Tom doesn't have to make a cake.

- Tom has to tidy the bedroom.

- Lisa has to make a cake.
Theo mình thì các câu trên thuộc thì Present Simple.