1.Helen started to grow these treesforour school two months ago

= Helen has grown these treesforour school for two months.

2.It isn't necessary for students to wear uniforms everyday in a week

= Students don't need to wear uniforms everyday in a week

3.We should use energy-saving light bulbs to protect the environment

= Energy-saving light bulbs should be used to protect the environment.

4.Linda said to the Browns ,''Are you having a barbecue outside this villa tonight ''

= Linda asked the Browns if she was having a barbecue outside this villa that night

1.Helen started to grow these treesforour school two months ago

- Helen has grown these treesforour school for two months.

2.It isn't necessary for students to wear uniforms everyday in a week

-Students don't need to wear uniforms everyday in a week

3.We should use energy-saving light bulbs to protect the environment

- Energy-saving light bulbs should be used to protect the environment.

4.Linda said to the Browns ,''Are you having a barbecue outside this villa tonight ''

- Linda asked the Browns if she was having a barbecue outside this villa that night

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