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careful adj.
helpless adj.
help v.
→
helpful adj.
She is wearing a _______.
helmet
Do you think it necessary for a bike rider to wear a helmet?
Listen to 1a and complete the sentences.
We should never ride ______ _____.
We should wear bicycle ________ when riding.
We should have _______ on the bike or wear _____________ clothes while riding at night.
We should learn more ______ ______.
1b
too fast
helmets
lights
light-colored
traffic rules
Grammar(if)
Blackbord words
eg,If everyone obeys the traffic rules, the roads will be much safer.
eg,We won’t go for a picnic if it rains tomorrow.
eg,We will get a fine if we don’t follow the traffic rules.
eg,If he studies hard ,he will pass this exam.
由if引导的状语从句叫条件状语从句。这个从句可以放在主句的前后，在这个从句中，如果主句是一般将来时或具有将来的含义，从句的谓语动词常用一般现在时表示将来。
2a
break the rules get a fine
Look at the pictures. Discuss the results of breaking the traffic rules with if. The expressions under each picture may help you.
cross a busy road be in danger