It’s necessary for usevery subject well.

I argued with my best friend . what advice do you have for me? —Well, you _________ say you are sorry, although it’s not easy.

John is the boylegs were badly hurt in the accident.

We have a job _____ you _____ a waiter.[ ]

I bet Mrs Black will come to help us with the celebaration if she _____ too busy tomorrow. [ ]