1.If you play computer games for long ,it (be)bad for your eyes.2.If you buy a camera for your father,he ( felt)very happy.3,If it (rain)this Sunday,we (stay)at home.4.If you don't know how to seng an e-mail,I (teach)you.

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1.If you play computer games for long ,it (be)bad for your eyes.2.If you buy a camera for your father,he ( felt)very happy.3,If it (rain)this Sunday,we (stay)at home.4.If you don't know how to seng an e-mail,I (teach)you.
1.If you play computer games for long ,it (be)bad for your eyes.
2.If you buy a camera for your father,he ( felt)very happy.
3,If it (rain)this Sunday,we (stay)at home.
4.If you don't know how to seng an e-mail,I (teach)you.

1.If you play computer games for long ,it (be)bad for your eyes.2.If you buy a camera for your father,he ( felt)very happy.3,If it (rain)this Sunday,we (stay)at home.4.If you don't know how to seng an e-mail,I (teach)you.
will be
will feel 
rains  ,will stay 
will teach 


不明白欢迎追问,

1.would be
2.would feel
3.rains, would stay
4.will teach
答案不一定,看虚拟语气的可能性程度。
过去时就是发生可能性低,现在时就是发生可能性高。

Will feel;rains,will stay;will teach

1.If you play computer games for long ,it will be bad for your eyes.
2.If you buy a camera for your father,he will feel very happy.
3,If it rains this Sunday,we will stay at home.
4.If you don't know how to send an e-mail,I will teach you.

1will be 2 will fell 3rains will stay4will teach