can be - The word "dream" ... a noun or a verb., managed to find  - We didn't know where David was, but we ... him in the end., could speak  - My grandfather ... five languages., could stay - Maybe I ... with Sarah when I go to Paris., couldn't have been - We had a really good holiday. It ... better., must be - You've been travelling all day. You ... tired., must have dropped - "I've lost one of my gloves." - "You ... it somewhere"., might rain - Take an umbrella with you. It ... later., has to travel - Jane ... a lot for her work. , must be received - Applications for the job ... by 18 May. , haven't been able to  - I ... sleep very well recently. , shouldn't have gone out - The boy ... without the doctor's permission., should do - He ... exercises every morning. , should have got - I wonder why they are so late. They ... here long ago. , Will ... give - ... you ... me a call when you get to the hotel?, must have been reading - I ... for three hours. It's getting dark., may have arrived - They ... already, but i'm not sure. , would stay ... have to - I ... a little longer, but I really ... go., Would you like - ... to eat with us tonight?, would walk out - Whenever Richard was angry, he ... of the room.,

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