1、She has studied(study) English for three years. 【解析】for three years是现在完成时的标志,表示从过去持续到现在的动作。 2、They are playing(play) football in the playground now. 【解析】now是现在进行时的标志,表示正在进行的动作。 3、I will visit(visit) my grandparents next weekend. 【解析】next weekend是将来时的标志,表示将要发生的动作。 4、He was reading(read) a book when I called him. 【解析】“was + 现在分词”构成过去进行时,表示过去某个时间正在进行的动作。 5、We have been(be) friends for many years. 【解析】for many years是现在完成时的标志,且be动词的现在完成时形式为have/has been。 6、She doesn't like(not like) coffee. She prefers tea. 【解析】主语为第三人称单
