1） 代詞each和由every, some, no, any等構成的'複合代詞作主語，或主語中含有each, every, 謂語需用單數。
Each of us has a tape-recorder.
There is something wrong with my watch.
The Arabian Night is a book known to lovers of English.
3） 表示金錢，時間，價格或度量衡的複合名詞作主語 時，通常把這些名詞看作一個整體，謂語一般用單數。(用複數也可，意思不變。)
Three weeks was allowed for making the necessary preparations.
Ten yuan is enough.
