could/ should / would + infinitive/ have + past participle

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Look at the sentences below, and put the verbs in brackets in the right form.

Could

1. Drive slowly. You could an accident. (have)
2. You drove too fast. You could an accident! (have)

3. I was very lazy when I was a student. I should harder. (work)
4. You are a very lazy student. You should harder. (study)

5. I would you with those books, but I only have one arm. (help)
6. Unfortunately, I was very ill yesterday. Otherwise, I would to work. (come)