写出下列动词的ing形式get→ sit→ collect→ 写出下列动词的第三人称单数形式live→ catch→ do→ go→ read→ study→在下列单词前的横线上加上a或an（）book （）engineer （）apple （）elephant （）cleaner （）university

getting sitting collectting
lives catches does goes reads studies
a book an engineer an apple an elephant
a university

get→getting
sit→sitting
collect→collecting
live→lives
catch→ catches
do→does
go→goes
read→reads
study→studies
a book
an engineer
an apple
an elephant
a cleaner
a university

getting sitting collecting
lives catches does goes reads studies
a an an an a a

getting sitting collectting
lives catches...都加es
a an an an a a

getting sitting collecting
lives catches does goes reads studies
a an an an a a

getting sitting collecting
livs catches does goes reads studies
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getting sitting collecting
lives catches does goes reads studies
a an an an a an
这些可以吗?

getting sitting collecting
lives catches does goes reads studies
a an an an a an