完成造句一句就行了。第五个作业

：I begin to have class.我开始上课了。：I began to learn to swim last summer.我去年夏天开始学游泳的。：I will begin to set up my company this year.今年我打算开始建公司。：I've begun to toil away at my study.我已经开始努力学习了。