④ Everybody _____(sit) and ______(wait) in the shade of the trees while the family begins to wake up and move off. ⑤ We realize that the bond between members of a chimp family ____(be) as strong as in a human family. ⑥ When she first arrived in Gombe in 1960, it ___(be) unusual for a woman to live in the forest.

sits

waits

is

was

结论： 1.表示集合的名词作主语，若强调集体中所有成员时，谓语动词用复数形式。（①） 2.动名词或动名词短语及不定式在句中作主语时，谓语动词用单数形式。（②⑥） 3.第三人称单数（③），单数意义的不定代词（④），可数名词单数（⑤）或不可数名词作主语时，谓语动词一般用单数形式。