二、 现在分词的构成： 1.大多数动词后可在动词后直接加-ing． Eg: carry-carrying,catch-catching,drink-drinking, enjoy-enjoying hurry-hurrying ,do-doing , read-reading , think-thinking 2. 如果动词以-e结尾,则去掉-e,再加-ing, 如come-coming , have-having , make-making,ride-riding,write-writing,take-taking,use-using． 3. 如果动词只有一个元音字母,而其后跟有一个辅音字母时,将此辅音字母双写,再加-ing 如： hit-hitting,let-letting, put-putting,run-running,sit-sitting． 4. 如果动词有两个音节,且重音在第二个音节上,则末尾的辅音字母须双写,再加-ing, 如: for’get-forgetting,pre’fer-preferring,up’set-upsetting．试比较 ’benefit/benfiting, ’differ/differing,’profit/profiting,这些词的重音在第一个音节上,因此其末尾的辅音字母不双写． 5. 以 -ic 结尾的动词,应先把 -ic 变为 -ick,再加 -ing,eg: panic/panicking,picnic/picnicking,但 lie/lying ,die/dying,tie/tying是特殊变化要记住． 本文来源：https://www.wddqw.com/doc/5d5218f4ba0d4a7302763ac5.html