情景
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条件从句的谓语动词
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主句的谓语动词
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与现在事实相反
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动词过去式 (be要用were)
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should
+动词原形
would
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与过去事实相反
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had
+过去分词
|
should
+have+过去分词
would
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与将来事实相反
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1、动词过去时
2、should +动词原形
3、were to +动词原形
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should
+动词原形
would
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注:如果条件从句谓语动词包含有were或had,
should, could有时可将if省去, 但要倒装。如:
Had you (If you had) invited us, we would
have come to your party.
2、 虚拟语气在各种从句的应用
(1) 在主语从句中用来表示惊奇、惋惜、理应如此等,其谓语形式是"should(可省) +动词原形",常用于以下三种句型中。
句型一:It is necessary (important, natural,
strange, etc) that…
句型二:It is a pity (a shame, no wonder, etc)
that…
句型三:It is suggested (requested, proposed,
desired, etc) that…
如: It is strange that he (should) have done
that.
It is a pity that he (should) be so
careless.
It is requested that we (should) be so
careless.
(2) 在宾语从句中用于suggest, propose, move, insist, desire, demand, request, order, command等动词后的宾语从句中,表间接的命令和建议。其谓语形式是"(should)+动词原形"。如:
I suggest that we (should) go swimming.
(3) 在表语从句中,表示间接的命令,要求、请求、建议、决定等,主句中的主语通常是suggestion, proposal, request, orders,
idea等。从句谓语形式是"(should)+动词原形"。如:
His suggestion is that we (should) leave at once.
(4) 在同位语从句中,谓语形式是"(should)+动词原形"。如:
We received order that the work be done at once.
(5) 在It
is time that…句型中,其谓语动词形式是"动词的过去式"或
"should +动词原形",should不可省。如:It's time (that) we went ( should go) to school.