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2. Not until it was too late I remembered / did I remember I call Susan.

3. Hardly had we settled down in our seats than/when the lights went out.

4. Only after checking three times I was/was I certain of the answer.

5. At no time I was aware/was I aware of anything out of usual.

6. Only Mary and Sally passed/did they pass the final examination

.7. So the waves were high/ So high were the waves that swimming was dangerous.

8. Only when Peter has arrived/ has Peter arrived can we begin the program

9. No sooner had it stopped raining than/when the sun came out.

10. If should you leave early/ should you leave early could you give me a lift?