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句子单数变复数1.主格人称代词要变成相应的复数主格人称代词，即I→We,you→you,she/he/it→they.如：Sheisagril.→theyaregirls.2.am,is要变为are.如：I”mastudent.→Wearestudents.3.不定冠词a,an要去掉。如：Heisaboy.→Theyareboys.•4.普通单数名词要变为复数形式。如•Itisanapple.→Theyareapples.•5.指示代词this,that要变为these,those,如：•Thisisabox.→Theseareboxes.•6.man,woman等名词作定语修饰可数名词时，要在“数”上与被修饰名词保持一致。但其他名词修饰名词表示“性质”时，不作变化。如：•①Sheisawomandoctor.→Theyarewomendoctors.•②Thatisabananatree.→Thosearebananatrees.•1、Thisisabike.•2.Thatisherbook.•3.Thatisaneraser.•4.Itisaredorange.•5.Heisateacher.Thesearebikes.Thosearetheirbooks.Thoseareerasers.Theyareredoranges.Theyareteachers.•6.What'sthis?•7.ThisisaChineseboy.•8.Thisismymother.•9.Iamastudent.•10.Aphotoisonthewall•.•11.Itisanactionmovie.Whatarethese?TheseareChineseboys.Theseareourmothers.Wearestudents.Thephotosareonthewall.Theyareactionmovies.