If you can open the box,I can close it.这一句是虚拟吗?

you can not open the box if you do not 有关英语语言学的,if you ask somebody"can you close the box?" he answ I can't lift the box if you don't help me .I ___be ___to the Can you ___ (opening/open) this box ? if you cando it,so can I. I can do it if you kissme I _____ you feel cold ,you can close the window. The box is too heavy .Can I help you?A No Thanks B it 's ver Let me help you to carry the box. I can do it by _______ 填什么 Can you lift the box? If the phone___ ,can you answer it? If the phone_______,can you answer it?