使用不定式时,大多数情况下要带有不定式的符号“to”,少数情况不用“to”。
1.不定式做主语。
不定式做主语时,通常使用形式主语。而将做主语的不定式放在句子的后面。
I think it would be a good idea to have comments from secretaries and typists who are already using it. (P.25, Senior Book3)
How long will it take you to complete the trip? (P.9, Senior Book2B)
2.不定式做宾语。
I have decided to take a lot of cabbage in vinegar. (P.7, Senior Book3)
Agriculture first started about 10,000years ago, when people began to grow crops in the river valleys of the Nile in Egypt, in the Middle East and in India. (P.20, Senior Book3)
不定式做宾语时也有使用形式宾语的问题,但必须同时具备两个条件:①有宾语补足语。②宾语是动词不定式短语或宾语从句。
The dusty air makes it difficult to get a clear picture of space. (P.10, Senior Book2B)
以上句子中,it为形式宾语;difficult为宾语补足语;不定式短语to get a clear picture of space是真宾语。
3.不定式做表语
It has been proved that the way to produce the most food is to let farmers grow crops either to feed their family or to sell. (P. 22, Senior Book3)
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