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1. It possible it's a tsunami.
It might/could be a tsunami.
2. I'm sure the disease is very painful.
The disease must be very painful.
3. Perhaps the volcano is danderous.
The volcano could be danderous.
4. I'm not going to climb that mountain. Obviously, you think I'm an idiot!
I'm not going to climb that mountain. You must be thinking I'm an idiot!
5. It's impossible for a drought to last forever.
A drought can't last forever.
6. Maybe she's lost in the forest.
She might be lost in the forest.
7. I don't belive that anyone enjoys this awful weather - not even you!
You can't enjoy this awful weather! I don't believe you!
8. I can't decide whether to get help.
I might get help. I haven't decided yet.