过去进行时态的构成: was / were + doing  .

用法:表示过去某一时刻或某一段时间正在进行的动作，一般用时间状语来表示。

I was standing in front of the library when the UFO arrived .

Play the tape twice . Circle the correct responses .

Check the answers .

Step 4  Post-task

Talk about what people were doing when the UFO arrived .

Step 5  While-task

SB Page 19 , 2a .

Read the sentences .Make sure the Ss understand what they mean .

Play the tape twice .Order these statements .

Play the tape again ,correct the answers .

SB Page 19 , 2b .

Read the instructions .

Play the recording .Write “when” or “while” on each line .

Play the recording again ,correct their answers .

Notice: when / while

When comes before a quick action that happens only once .The word “while” comes from an action that continues for some time .

Step 6  Post-task

SB Page 19 , 2c .

Point ort the picture .Ask what each person is doing .

Groupwork : Ask “What was …doing when the UFO arrived ?”

Ask a group to say its conversation to the class .

Step 7  Grammar Focus

Review the grammar box by asking some students to read the sentences .

Homework :

Go over the words in this unit

用介词或介词短语填空。

They were talking     the phone .

I was     the barber’s chair .

The boy was walking     the street when a UFO landed .

I had a very unusual experience     Sunday .

The alien visited the Museum     Flight .

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