Complete the sentences with the correct forms of the verbs.

Choose the correct option.

Olivia must [to stand|standing|stand] up for herself at school.

I am thinking about [to take|taking|take] responsibility for my actions.

There is no point in [to try|trying|try] to prove him right. He'll keep his own.

I expect you [to be|being|be] more polite to your grandparents.