大概也许不一定用英语怎么说

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生活中很多事情不能“确定一定以及肯定”，这时候就需要说“大概可能也许不一定”了。英语中能表达这个意思的都有哪些句型呢？
　　1.用I'd say加上一个独立分句
　　I'd say he's about ready to quit his job.
　　我想说他大概准备好辞职了。
　　t加上动词原型　　
　　It might need some oil.
　　可能需要一些油。
　　d 加动词原型
　　He could be in the garden.
　　他可能在花园里。
　　4.用look like加上名词
　　It looks like a miniature motor.
　　这东西像是个微型马达。
　　5.用perhaps做句子的开头
　　Perhaps he needs some time off work.
　　也许他需要一些时间休息。
　　6.用maybe开头
　　Maybe they want to come and visit this summer.
　　也许他们今年夏天想来看看。
　　7.用It's difficult to say, but I'd guess 加上一个独立分句
　　It's difficult to say, but I'd guess that it's used for cleaning house.
　　这很难说，不过我想这是用来清理房间的。
　　8.用I'm not really sure, but I think 加上一个独立分句
　　I'm not really sure, but I think they enjoy hiking in the mountains.
　　我不是很确定，不过我想他们很喜欢在山里徒步。