This is a speaking exercise for pre-intermediate level learners and above. It revises time references and past simple.
This is a speaking exercise for modal verbs used to express possibility, for intermediate / upper-intermediate classes.
This is a communicative exercise to practise using question tags with rising intonation when you are not sure that your ideas are right.
This activity looks at ways of making comparative forms by asking learners to compare things that are usually thought of as opposites.