Objectives: 1. To use “between…and…” to express a period of time 2. To use “from… to…” to express a period of time 3. To use “before”, “after” and “until” to talk about when things happen 4. To use “while” and “so” to talk about when things happen 5. To use comparative and superlative adverbs 介词短语:表示一段特定的时间: from…to 表示“从……到” 我通常每晚九点到十点看书。 I always read books from nine to ten every night. 这家店通常周一到周五营业。 The shop usually opens from Monday to Friday. between… and 表示“在……和……之间” 我今晚七点到八点之间可以看电视吗? Can I watch TV between seven and eight tonight? 这个小女孩喜欢在午饭和晚饭之间吃些零食。 The little girl likes to eat some snacks between lunch and supper?