è¿æ¯ä¸ä¸ª
主è¯ä»å¥.èIt's .thatæ¯
强è°å¥ï¼1ï¼ä¸»è¯ä»å¥.
It is important that students today master English.
It is reported that China will send up a series of spaceships in the 21st century.
It is a rule that everyone should obey the Stateâs laws.
It happened that they were out visiting their friends.
å¯ä»¥çåº,æ¤ç±»ä¸»è¯ä»å¥ç
å¥åæåæ 论æ¯ä¸»è¯ãè°è¯ã宾è¯,è¿æ¯åç§ç¶è¯é½æ¯å®æ´ç,并ä¸ä¸è½ç§°å°âIt isâ¦âç»æä¸å».è¿å°±æ¯å¤å«ä¸»è¯ä»å¥çåºæ¬ç¹.
ï¼2ï¼å¼ºè°å¥.
å
举ä¸ä¸ªéç¹æåå¥ï¼æ¨å¤©æå¨ä¹¦åºçè§äºä».I saw him at the bookstore yesterday.
ç°å°æ¤å¥åæåå«çªåºä¸»è¯ã宾è¯ãå°ç¹åæ¶é´ç¶è¯ç强è°å¥ï¼
AãIt was I that/who saw him at the bookstore yesterday.
BãIt was him that I saw at the bookstore yesterday.
CãIt was at bookstore that I saw him yesterday.
DãIt was yesterday that I saw him at the bookstore.