Give the correct form of the following verbs.
1. If we go on littering, the environment (become) __________ seriously polluted.
2. When I came, she (cook) __________ in the kitchen.
3. They (learn) __________ English since 2010.
4. If you were the president, what you (do) __________ to help the environment ?
Give the correct form of the following verbs.
1. If we go on littering, the environment (become) will become seriously polluted.
2. When I came, she (cook) was cooking in the kitchen.
3. They (learn) have learnt English since 2010.
4. If you were the president, what could you (do) do to help the environment ?