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?二次备课Step 1?Lead in (导入新课)
1.Presentation
Show some sentences on the blackboard and get students to recognize the types of these sentences.
（教学目的：激活学生的旧知，以旧带新，降低难度）
1.?If there is no fresh food, meals will not be as tasty as they are today.
2. It would be funny to play football on Mars?because of?the low gravity.
3. Scientists?are in agreement that?living on Mars would be possible for humans in the future.
4. Mars is a planet?which has?no air.
(教学目的：呈现三种不同的从句，让学生思考其他的表达方式)
2.Check the answers
KEYS：
--1.Without fresh food, meals will not be as tasty as they are today.
--2. It would be funny to play football on Mars?because the gravity is low
--3. Scientists?agree that?living on Mars would be possible for humans in the future.
--4. Mars is a planet?with?no air.
(教学目的：核对答案，引出本节课的三种从句的转换)
?
Step 2：Part A
Using adverbial clauses or simple sentences.
（教学目的：学习状语从句与简单句的转换）
1.We can rewrite some adverbial clauses in simple sentences with prepositional phrases beginning with?at the age of, because of and without.
Neil Armstrong received his students pilot’s licence when he was 16.
Neil Armstrong received his students pilot’s licence at the age of 16.
People might float in space because the gravity is low.
People might float in space because of the low gravity.
Humans cannot survive without food, water or oxygen.
Humans cannot survive food, water or oxygen.
2.Practice
Ask students to do exercise of Part A. Explain the requirement of the exercise.
Daniel is writing about visiting about visiting another planet. Help him rewrite the sentences using the words in brackets.