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families with kids form a small group they ask their aging parents for help they give up their jobs they take cheir kids wherever they go
to take, to taking, to to take, with taking, with
out of date a solution without question a complaint
post-80s couples and their friends post-80s couples and baby-pooling post-80s couples and their parents kids and their grandparents
i= Im sin ω t i= Im sin（ω t＋90°） i= Im sin（ω t－90°） i= Im sin（ω t＋180°）.
mustn’t needn’t haven’t to can’t
i=Im sin（ω t＋180°） i=Im sin（ω t－180°） i=Im sin（ω t＋90°） i=Im sin（ω t－90°)
take part in; join join; take part in join; join in join in; take part in
i=Im sin（ω t＋180°） i=Im sin（ω t－180°) i=Im sin（ω t＋90°） i=Im sin（ω t－90°）
have asked to have been asked to haven't asked to haven't been asked to
It isn’t going to rain. --- Well, I don’t know. It ______ do. A. might need would should
to take; to taking; to to take; with taking; with
e=Imsinωt e=ImωLsin（ωt+90°） e=ImωLsin（ωt-90°） e=ImωLtsinωt
The parents can have much more free time. The kids can make new friends. The kids won’t be hanging around their parents all day long. All of the above.
they have to look after their kids they have to look after their parents they are busy with their work they have no money
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