①让某人做某事怎么说?②We are tired.Let's (to relax).这句话对吗?请说明理由如果有错并改正!③Why not （take）a taxi to go home?这句话对吗?请说明理由如果有错并改正!④And the dolphin can act as people do（because）it is very smart.这样说好还是说so好呢?如果您不解释,还不如不回答!

1 let sb.do sth.
2 错.let后跟动词原形,let's relax.
3 对.why not do sth
4 个人认为because好.如果句首没有and,也可以用so.
5 bad[bæd]
adj.坏的,不好的,差的,疼痛的
adj.Smoking is bad for health.
adj.吸烟对身体有害.
adj.坏的
adj.In the recession,our firm went through a bad time.
adj.我们公司在经济衰退时期历尽艰辛.
adj.He's gone to bad since he made friends with those people.
adj.他结交那些人后就开始堕落了.
adj.Their travel plan was cancelled because of the bad weather.
adj.因为天气不好,他们的旅行计划取消了.
adj.不好的
adj.His shabby appearance creates a bad impression.
adj.他那寒酸的样子给人留下不好的印象.
adj.It's a very bad thing to leave things around.
adj.把东西到处乱扔是很不好的习惯.
adj.差的
adj.Bad eyesight is less common in this part.
adj.这地区很少有视力差的人.
adj.A bad workman quarrels with his tool.
adj.手艺差的工人总是抱怨工具不好使.
adj.疼痛的
adj.I felt bad all day.
adj.我整天觉得不舒服.
adj.She's got a bad headache.
adj.她头痛得厉害.
n.坏事,坏人
n.坏事
n.You must learn to take the bad with the good.
n.人必须学会好坏都能承受.
n.坏人
n.He was for putting bad men behind bars.
n.他赞成将坏人关进*.
n.The bad man will suffer eternal damnation.
n.坏人将会受到永远的惩罚.
adv.非常,不好地
adv.非常
adv.That's what I want,and I want it bad.
adv.这就是我想要的,而且是迫不及待要得到的.
adv.不好地
adv.Alison sings bad.
adv.艾莉森唱得很糟.
adj.严重的,有害的,腐败的,低劣的,不利的,不舒服的,不健康的