翻译几个句子（汉译英）

在公共汽车上给老人让座是有礼貌的。 It is polite for you to offer your seat to old people on the bus .
2.明天我不出席会议要紧吗？ Is it matter if i will not attend the meeting ?
3.我觉得帮助他人是一件很快乐的事 i think it is happy thing to help others .
4。一个人到河里游泳是很危险的 It is very dangerous to swim alone in the river .

1 It is polite to yield up your seat on the bus to an old person.
2 Does it matter if I don't attend the meeting tomorrow?
3 I think it pleasant to help others.
4 It is dangerous to swim in a river alone.

1 On a bus for the elderly Parks is polite.
2. Tomorrow I did not attend the meeting important?
3. I feel that helping others is a very happy thing
4. One person to swim the river is very dangerous