Advice, requests, ability and possibility

1. Modal verbs.

Look at this text about Repetitive Strain Injury (RSI). Can you find the modal verbs?

2. The grammar of modal verbs.

Choose the grammatically correct sentence.

3. The grammar of modal verbs.

Are the following statements about modal verbs true or false?

For more information about modal verbs see the Grammar Reference.

4. Spot the errors.

Which sentences are grammatically correct and which are incorrect?