=3= It is...that..已經(jīng)是強調(diào)句啦.
是Light travels in straight lines is known to all.的強調(diào)句.
如果對你有所幫助,還望采納哈!
如還有不懂的,還可以繼續(xù)追問哦\(^o^)/~第一個是強調(diào)句，It是形式主語，
light travels in straight lines是真正的主語
is known to是謂語
all 是賓語
第二個是時間狀語從句the plane是主語is to take off是謂語has not been announced是賓語 這兩句的句子成分劃分的對嗎
It is known to all that light travels in straight lines.
It is known to all that light travels in straight lines.
When the plane is to take off has not been announced . 是什么從句及句子成分
When the plane is to take off has not been announced . 是什么從句及句子成分
英語人氣：433 ℃時間：2020-05-09 14:28:13
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