1 .条件状语从句：条件从句可由if, unless, suppose, supposing, in case, so ( as ) long as, on condition ( that ), provided ( that )等词引起：
They can t be up early if they go to be bed late.
Unless sleep is adequate, no one feels like exercising.
In case I forget, please remind me about it.
She didn t mind anything so long as she was with Jimmy.
I'll stay as long as you want me .
I'll come on condition that Amy is invited, too.
2 .让步状语从句：让步状语从句可由though, although, even if, even though, however, Whatever, no mattar 等词引起：
He went Out, though it was raining .
Although thy are poor they are happy .
She was English, even if she spoke more like an Italian.
Even though it would be Sunday, I thought he might be willing.
He can answer the question however hard it is.
Whatever you decide to do, I'm behind you,
We wanted to dance, no matter what the music was.
1. He might be cross if he knew we were here.
2. I shall return Thursday unless something unexpected happens.
3. Suppose ( supposing ) your father saw you what would he say ?
4. In case he arrives before I get back, please ask him to wait.
5, Your conduct, as far as I can see, is absolutely unjustifiable.
1. Though it was weak, it could fly.
1. Though it was weak
2. Although I was tired, I had to go on working.
2. Although I was tired
3. Even if she were dying of a brokenheart she would not say so.
3. Even if she were dying...
4. He is an honest man, even though I have opposed him,
4. even though I have opposed him
5. We shall never succeed however much we try.
5. however much we try