1, If i were you, i would plant the vegerables in the garden
2. more tourist will be come here if the beach is cleaner
3. What would happen if there were no cars in the world

1.If/ I/ be/ you/, I/ plant/ vegetables/ garden.
--> If i were you, i could plant vegetables in the garden.
2.More/ tourist/ come/ here/ if / beach/ be/ cleaner.
--> If the beach were cleaner, more tourist would come here.
3.What/ happen/ if / there/ be/ no/ car/ world?
--> What could happen if there were no car in the world? 
4.If/ I/ be/ his mother/, I/ ask/ tidy/ room/ every day.
--> If i were his mother, i would ask for tidy room every day.
5.If/ there/ be/ no/ war/, people/ live/ more/ happy.
If there were no war, people could live more happiness.
6.Soil/ not/ be/ so/ polluted/ if/ farmers/ not use/ much/ chemical/ fertilizer.
If the farmers didn't use much chemical fertilizers, the soil couldn't be so polluted.