晒钩汕康骶浠蚨ㄓ锎泳洌?秸呒?谆煜?Ｒ话憷此担?玦t is/was...与连接词去掉,句子仍然正确,就为强调句型.这时,就选用that连接词；否则,就为定语从句,其关系词的选择,应根据先行词与从句的关系而定.例1.(1) It is on the island that they spent 10 years.(2) It is the island where (on which) they spent 10 years.比较：(1)该句为强调句.表示地点的名词the island前有介词与其连用,说明它是一个完整的地点状语.如果将it is去掉：They spent 10 years on the island.它的意义仍然完整.故应选用连接词that构成强调句式 (注：强调地点状语时,不可用where连接).(2)该句为定语从句.表示地点的名词the island前没有介词与其连用,说明它不是一个完整的地点状语.如果将it is去掉：They spent 10 years the island.它的意义不完整.故应选用关系副词where或on which 构成定语从句结构.例2.(1) It is on the date that she went abroad.(2) It is the date when(on which) she went abroad.比较：(1)分析句子结构可知,在表示时间的名词the date 前有介词与其连用,说明它是一个完整的时间状语.如果将it is去掉：She went abroad on the date.它的意义仍然完整.故应选用连接词that构成强调句式(强调时间状语时,不可用when连接).(2) 分析句子结构可知,在表示时间的名词the date 前没有介词与其连用,说明它不是一个完整的时间状语.如果将it is去掉：She went abroad the date.它的意义不完整.