一、名词
1、内部，里面
There is a label on the inside of the box.
盒子内侧有个标签。
The inside of the box was blue.
盒子的内面呈蓝色。
The door was locked from the inside.
门从里面锁上了。
2、(人行道、道路的)内侧
That car tried to pass me on the inside.
那辆汽车试图从道路的内侧超过我。
The French runner is coming up fast on the inside.
法国的赛跑选手正从内圈迅速赶上来。
3、内幕，内情
He is on the inside of that deal.
他知道那笔交易的内幕。
4、肚子，肠胃
I have a pain in my insides.
我肚子疼。
She was so nervous, her insides were like jelly.
她紧张得六神无主。
二、介词 在（或向）…内；在（或向）…里
You'll feel better with a good meal inside you.
你肚子饱了感觉就会好些的。
They did a lot of work inside the trade unions?
他们在工会内做了许多工作。
He had only been inside the house twice.
这屋子他只进去过两次。
Inside the box was a gold watch.
盒子里装着一只金表。
三、副词 在（或向）里面
I went quickly inside the drawing room.
我快步走进客厅。
She shook it to make sure there was nothing inside.
她把它晃了晃，以确定里面没有东西。
Don't let the dog come inside the house.
不要让狗到屋里来。
四、形容词
1、内部的；里面的
I was driving up at seventy miles an hour on the inside lane on the motorway.
我在高速公路的慢道上以每小时70英里的速度行驶。
Sloane used inside diplomatic information to make himself rich.
斯隆利用外交内幕消息发了财。
2、从内部了解到的；内线干的
Any newspaper would pay big money to get the inside story on her marriage.
任何报纸都愿出高价购买关于她婚姻的内情。
The robbery appeared to have been an inside job.
这次抢劫像是内部人干的。
习语：
inside out 里面朝外
You've got your sweater on inside out.
你把毛线衫穿反了。
Turn the bag inside out and let it dry.
把包翻过来晾干。
on the inside 属于某团伙（或组织）的；知情的
They must have had someone on the inside to help them break in.
他们一定有内应，协助他们闯了进去。
The thieves must have had someone on the inside helping them.
这些窃贼肯定有内应。
turn sth inside out
1、把某处翻得乱七八糟
The burglars had turned the house inside out.
窃贼把房子翻了个底朝天。
2、引起巨大变化
The new manager turned the old systems inside out.
新任经理对旧体制进行了彻底的改革。
know sb/sth inside out | know sb/sth like the back of your hand 对…极为熟悉（或了如指掌）
This is where I grew up. I know this area like the back of my hand.
我在这儿长大的，我对这地方再熟悉不过了。