Infants can learn words for uncommon things long before they

Infants can learn words for uncommon things long before they they can do many things for they can learn some better ways of ( ) things the two friends______each other for a long time before they They can walk for a long time.（同义句）They can walk ___________ it was not long before they set out for the front . all things are difficult before they are A year before I believed we (can) stay for a long time是什么句式 we can learn many things form it They haven't lived here for very long.They can't _____ many Long before they graduate from high school How long can they live?