A kille whale can not jump out of water.将一个肯定句变成否定句的原则:
1.如果原句中含有情态动词,如 can shoud will等,则直接在其后加“not”.
2.如果原句中没有情态动词,没有助动词,则加“do not” 或“does not”等.
E.g:She helps her mother do the housework.
否定句为:She doesn't help her mother do the housework.(第二个do 为实意动词)
You should watch TV.
否定句为:You should not watch TV.