We can use to-infinitives to express purpose. e.g. I often go to the market to watch the birds Now the Chinese government has made laws to prevent all these things. We can also use in order to to express purpose. This is more formal than using to-infinitives. e.g. Some people want to make the wetlands smaller in order to have more space for farms and buildings. Take a notebook with you in order to write down what you see.
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We can use verbs and to-infinitives together. At four months old, she started to go out side for the first time. When she was six months old, she began to eat bamboo. When she was 20 months old, she learnt to look after herself. We often use to-infinitives after these verbs. agree begin decide fail forget hope learn plan prepare remember try want
We use should and had better when giving advice and telling people what we think is the best or right thing to do. The tone of had better is stronger than should. e.g. you should know a little about DIY. You should not put so many books on the shelf. Your watch is broken. You had better buy a new one. You had better not be late for school.
We use may to say that something is possible. e.g. If we do nothing, soon there may be none left! e.g. The bamboo forests are becoming smaller and smaller.As a result , pandas may not have a place to live or food to eat.