1.I'm so happy.

2.You're very cold.

3.He's very thirsty.

4.She's very tired.

5.It's so hot.

6.We're so hungry.

7.You're very scared.

8.They're so brave. 

1 I'm happy that you passed the exam.

2 You're cold because you go out without a coat.

3 He's thirty because he ran 1km.

4 She's tired because she didn't sleep well last night.

5 It's hot because there isn't an air conditioner here.

6 We're hungry because we didn't eat anything this morning.

7 You're scared when you hear the bad news.

8 They're brave that they fell into the deep water.