4. Put the verb into the right form.
1 We sometimes ____ (have to) work at night last month.
2 When you are applying for a job you _____ (should/look through) a lot of advertisements.
3 What _____ last evening? (you/do)
4 ______ (you/hear) about Bob? – No, I haven’t. Where is he?
5 _______ (you/have to) work at weekends?