Having a native speaker allow you to deconstruct their grammar, by translating these sentences into past, present, future, will show you subject, object, verb, placement of indirect, direct objects, gender and so forth.
让一个本地人将这些句子翻译成过去，现在，和将来式， 就能使你解析他们的语法 找到主语、宾语、动词、 间接和直接宾语的位置、语法性别，等等。