They ... singing. , are, is, isn’t , aren’t , They ... climbing. , is, am , are, aren’t , I ... cooking. , is, am , isn’t , are , Billy ... diving. , is , am , aren’t , are , She ... jumping. , is, are, isn’t , am , He ... fixing his bike. , is , aren’t , am not , are , He ... singing. , aren’t , isn’t , is , am , They ... jumping. , isn’t , are , aren’t , is , I ... sleeping. , am not , isn’t , aren’t , am , He ... riding a bike. , aren’t , am , are, is, He ... acting. , am , are, isn’t , is , She ... singing. , are, is , isn’t , am not , We ... flying. , aren’t , is , am , are , You ... writing a letter. , aren’t , are , is , isn’t .

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