Ⅴ. Special difficulties. 难点。
A)朗读并口头翻译下面句子，小结 since 的用法。
1. Since then, I've wanted to help others too.
2. I signed up with Blue Sky Rescue in 2009, and I've been a volunteer ever since.
3. He has volunteered here since his summer holidays started.
4. Since you are unable to answer, perhaps we should ask someone else.
小结：句1中 since 用做 词，意为：；句2中 since 用做 词，意为：，与 ever 构成短语 ，意为：；句3中 since 用做 词，意为：，since 后跟句子 his summer holidays started 构成 状语从句；句4中 since 用做 词，意为：，since 后跟句子 you are unable to answer 构成 状语从句。

V. A)
介词,自从……以后;副词,自从……以后,ever since,从那时起;连词,自从……以后,时间;连词,既然,原因

B)根据汉语意思完成英语句子，每空一词。
1. I've been a volunteer there (自去年以来).
2. I've made a lot of friends (自从我加入) the organization.
3. (既然他回来了), you could now ask for his help.
4. I was bitten by a dog once and I've been afraid of them (从那时起).

B)1. since last year 2. since I joined 3. Since he has returned 4. ever since

Ⅰ. Observe the words and sum up the rules. Change the words into adjectives or nouns by adding the suffixes. Use your dictionary when necessary. 观察下列词汇并总结规律。通过添加后缀把单词变成形容词或名词。需要时可使用词典。
1. miss-missing interest-interesting
在部分动词后加后缀 ，可将其变为形容词。
2. success-successful care-careful
在部分名词后加后缀 ，可将其变为形容词。
3. tradition-traditional person-personal
在部分名词后加后缀 ，可将其变为形容词。
4. young-youth dead-death
在部分形容词后加后缀 ，可将其变为名词。
5. elder-elderly friend-friendly
在部分名词后加后缀 ，可将其变为形容词。
challenge- move- thank- wonder-
nation- music- week- love-
true- deep- long- strong-

I. 1. ing 2. ful 3. al 4. th 5. ly challenging, moving, thankful, wonderful, national, musical, weekly, lovely, truth, depth, length, strength