虚拟语气练习题用所给动词的适当形式填空：Part A.1. If people _(drive) more slowly, there wouldnt be so many accidents.2. If you had worked carefully, you _(not make) so many mistakes.3. The boat wouldnt have drifted away, if we _ (tie) it up.4. If I had known you already _(have) a typewriter, I _(not, buy) one for your birthday.5. If he _(be) here this afternoon I would go with him.6. If it were to rain tomorrow, the match _(postpone).7. But for your help, we _
