问题描述：
请问下列句子表达方式有错吗?
1.when they got to the middle of the river.
2.when they reached the middle of the river.
3.when they arrived to the meddle of the river.
4.when they were in the meddle of the river.
5.when they came to the meddle of the river.
6.when they swam to the meddle of the river
1.when they got to the middle of the river.
2.when they reached the middle of the river.
3.when they arrived to the meddle of the river.
4.when they were in the meddle of the river.
5.when they came to the meddle of the river.
6.when they swam to the meddle of the river
问题解答：
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