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疑问否定任你变，句首大写莫迟疑。
shine(shining) have(having) come(coming)
swim(swimming) run(running) drop(dropping)
1.直接+ing: sing(singing) eat(eating) look(looking)
2.去e +ing:
3.双写+ing:
play football
play basketball
skip
do morning exercises
jump
fly a kite
read a book
dance
swim
play hide-seek
drink soya milk
eat hamburger
be
is
am
are
+
动词-ing
正在进行时：
cat
how
c-ow 奶牛
blue
low