1·would you please not open the window?it's too cold outside.(去掉 to )
2`We did have a good time in the Summer Palace yesterday.( do -> did )
3`Do you have a more subjects now than you did in the first year.( 第二个do改为 did )
4Mozart was able to write beautiful songs when he was only a boy.
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Mozart could write beautiful music when he was only a boy.(去掉be able to 或去掉COULD ,把BE 改为 was)5`"may the news be true?""no ,it's not true ."15`We know that soldiers may obey orders from officers.John,you mustn't play with the knife,you can hurt yourself.5`"may the news be true?""no ,it's not true ."( may-> Is)15`We know that soldier may obey orders from officers./We know those soldiers may obey orders from officcers .( soldiers-> soldier或 that-> those )John,you mustn't play with the knife,you mayhurt yourself.( can -> may )