Now Helen's family (be) at home and (watch) TV.为什么用watching?

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NowHelen''sfamily__(be)athomeand__(watch)TV.为什么用watching?NowHelen''sfamily__(be)athomeand__(watch)TV.为

Now Helen's family __(be) at home and __(watch) TV.为什么用watching?
Now Helen's family __(be) at home and __(watch) TV.
为什么用watching?

Now Helen's family __(be) at home and __(watch) TV.为什么用watching?
are watching

is watching
family 这类词叫做集体名词。当我们把它当作一个整体的时候，就是单数；......