<正> The kangaroo is a strange animal. It lives in Australia. The motherhas a pouch (育儿袋). She keeps her babies in the pouch. The babieswill live there happi
<正> 1. ’Why is the potatofarmer in prison?’’Well, he {must ought to}{do have done} somethingbad, I suppose.’2. This {must, ought to}{be have been} the pota