③ 强调地点状语：It was at the railway station that I met Li Ming yesterday.
④ 强调时间状语：It was yesterday that I met Li Ming at the railway station.
(5) Note: The IT itself that constitutes an emphatic sentence has no meaning; The connectives in emphatic sentences are generally used only that, who, even when emphasizing temporal and place, which cannot be omitted; There are only two tenses in the emphasis sentence, the general present tense and the general past tense. The original predicate verbs are general past tense, past perfect tense, and past progressive tense, with It was..., and the rest tense with It is...
not ... until ... Emphasis sentences of sentence patterns
1. The sentence pattern is: It is/ was not until + emphasized part + that + other parts
如：普通句：He didn't go to bed until/ till his wife came back.
强调句：It was not until his wife came back that he went to bed.
2. Note: This sentence pattern only uses until, not till.
But if it is not an emphasis on sentence patterns, till, until can be universal;
Because it is/ was not ... It is already a negative sentence, and the clause after that should be affirmative, and never use a negative sentence.
Emphasis on predicate verbs
⒈ It is/ was ...... that ...... The structure cannot emphasize the predicate, and if the predicate needs to be emphasized, use the auxiliary verbs do/does or did.
Such as: Do sit down. Be sure to sit down. He did write to you last week. He did write to you last week. Do be careful when you cross the street. When crossing the street, be sure (always) be careful!
2. Note: This emphasis is only done in DO/DOES and DID and no other form; The past tense is used for did, and the following predicate verb is used as the original form.
