dogs are friends of man,but a long time before

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dogs are friends of man,but a long time before
Dogs are friends of man,But a long time before,dogs were wild all over the world。It can go back to the Stone Age.All dogs had the same ancestor(祖先),It is believe that this ancestor was much like a wolf .Thousands of years ago,man began tame (使驯服) the wild dogs.Then the strong dogs became work animals.找出五个错误

Dogs are friends of man,But a long time before(改为ago),dogs were wild all over the world.It(改为They) can go back to the Stone Age.All dogs had(改为have) the same ancestor(祖先),It is believe(改为believed) that this ancestor was much like a wolf .Thousands of years ago,man began (加上to)tame (使驯服) the wild dogs.Then the strong dogs became work animalshad是过去式,不是对的吗all dogs have the same ancestor狗有相同的补祖先。(我句是说一直到现在的情况,所以要用一般现在时)