e man was actually telephoning the police. Only when he saw that the man was actually telephoning the police did he realize that they had all been the victims of a fraud. 6 特别注意!!! 隐藏的助动词 do I understood the situation only then. Only then did I understand the situation. 7 ?需要前置的除了助动词 do 以外,还有系动词/情态动词以及完成时中的 have/has/had 8 Only+ 状语 The technology improved enough for the prices to drop sufficiently had made mercially viable only in the past few years. Only in the past few years had the technology improved enough for the price to drop sufficiently ma de mercially viable. 9 Practice 实用句型。 The environment can be dramatically improved only if we enhance our environmental awareness Only if we enhance our environmental awareness can the environment be dramatically improved. 10
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