unbrella前要加an吗

unbrella前要加an吗 a white umbrella 还是 an white unbrella? A few minutes later he returns with an unbrella Were I you ,I would take an unbrella with me. I have ______ an unbrella to your mother 我们都知道是an unbrella那如果单单字母U前用a还是an? He went out without an unbrella ____he was caught in the rai I had neither a raincoat nor an unbrella.____I got wet thoug 汉译英 是个游泳的好季节it's a good__ __ __ take an unbrella with you.it 是考虚拟么?If I ____ an unbrella with me ,I wouldn't get wet on t whose is the unbrella?和whose the umbrella is 是一样的吗? basketball前要加an吗