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Ride a bike is exercise.
Walking is exercise.
Tips:这是一个动名词做主语的句子。起名词的作用。动名词做主语时，谓语用第三人称单数形式。
骑自行车是锻炼。
步行是锻炼。
Riding
Can you fill in the blanks?
1._________(run) is exercise.
2._________(play) football is exercise.
3._________(walk) to the park is exercise.
4._________(ride) a bike is exercise.
5._________(skip) is exercise.
Running
Playing
Walking
Riding
Skipping
Riding, riding is exercise.
Walking, walking is exercise.
Running, running is exercise.
Playing, playing, is exercise.
Exercise is a (good/bad) habit.
√
Let’s learn some sentences:
2.How much exercise do we need?
我们需要多少时间的锻炼？
minute /’minit/ n.分钟
hour /’au?/ n.小时 (同音词our我们的)
an hour / one hour
half an hour