楼主我直接帮你改了,解析看后面
Today,i made milk tea.With my mother's help,i finally prepared the material.First,I soaked a bag of black tea with half a cup of water.Then i put sugar in the tea.The tea was hot,so the sugar quickly dissolved.Pouring the milk inside the cup,i blended the tea and the milk.It was near completion.After a few minutes,i took some ice from the refrigerator and placed them in the milk tea.I finished.In the future I would like to drink my selfmade milk tea.
第一行：固定词组：start doing something or start to do something
with someone's help
句子太长,应该断开来.i finally ready material没有动词.
第二行：first,i soaked a bag of black tea.the tea's water is cup's half 有点点累赘.
then put sugar in the tea 没有主语.后面那句话（because.)这样子接太长了.最好不要用because 做句子的开头.
第三行：then pour the milk inside the cup 没主语.tea and milk together.没动词.
第四行：wait a few minutes 不应该用祈使句,你不是在告诉别人做什么而是在陈述你自己在做什么,用陈述句.ice from the.没主语,时态要保持一致,用过去式就通篇用过去时.
第五行：finished 和最后一句话完全没有联系,要断开.
其他还有一些地方我自己认为改掉好一点,楼主介意的话就改回来吧,那些地方都不是语法错误,包括改变句子开头之类的.要记得一句句子里面必须有主语和动词,除非是祈使句,而这是一篇陈述问,所以不应该有祈使句的出现.另外记得保持时态一致.