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(1) We (would) (walk) home if it (were) (not) raining. [仮定法過去]
← [事実:現在] We will not walk home because it is raining. 
(2) If she (could) (speak) Chinese, I (would) (hire) her right away. [仮定法過去]
← [事実:現在]] She can't speak Chinese, so I will not hire her right away.
(3) If I (had) (known) Emily's phone number, I (could) (have) (called) her. [仮定法過去完了]
← [事実:過去] As I didn't know Emily's phone number, I couldn't call her.
(4) If he (had) (been) carefull, he (wouldn't) (have) (made) such a mistake. [仮定法過去完了]
← [事実:過去] As he was not careful, he made such a mistake.

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