they can standing between the two trees.改错

英语现在进行式的一点儿问题They can't see any assistants there,but only some robots standing there.请问为什么standing 不用加be动词,或者说这里的standing 词性不同? they can standing between the two trees.改错 how can they be they can be found they can be quarrelling now are theythey can not be quarrelling now ,------they?are?can?为什么 What can they be的意思 they can always ( be/are)friends Be the last man standing How can they be happy i____ they are not free? Canners can can what they can can but can not can things that can't be cannedcanners can can what they can can,but can not can things can't be canned.求每一句can的意思,词性 翻译:people can can what they can can but can not can things can't be canned 英语翻译They are standing _______ _______ . They aren't standing there.改为一般现在时. standing standing they are both nice people but can be rather dull . 这里的can be rather 是什么意思 用either...or连接下面句子thieves can be very daring .they can be very timid. they can be more perfect than is convenient.如何翻译?