第1个回答 2008-12-10
可以 比如:If you are going out,it's raining now.
还可都用一般时表必然习惯发生。If a baby is hungry,it cries.
If my dog hears any strange sounds,he barks.
If you eat bad plums,you get ill.
If I am happy,I smile.
If you have been walking all night,you need to have a rest.
If you are right,I am wrong.