 Chng hn: I want to play tennis. Đng t th nht l want, v đng t th hai l play. Mt v d! kh#c: I enjoy playing tennis. Đng t th nht l enjoy, v đng t th hai l play.  'to play'!" #'playing'$%"&"'!())**)+(!, playing!starting$ %-%)+..*)!'I want to play'/&"01 2$ ,34)+.)!'I enjoy playing'56$7,#89 : ;$ <89=# .*)!>',?!"I want to play tennis." <89=# ))!>')@$"I enjoy playing tennis." <89# A"&"BC89 D# A,#CD$ %"EF+'7G&"H# A"#84D +GHC$ %'start'!+'# #'start to do'"'start doing'!>'-"Last year I started learning Chinese""Last year I started to learn Chinese." AH"H#C&"7ID+J:K1L9$ %EF+'2M8+)&N&"H,OPQF'stop'$ RSTQS# ,P)8+UA.*)/))/, "NVCD$ #W0-"He stopped to have lunch"""He stopped having lunch""#  &""D""HC$ "He stopped having lunch "#C&"&'1Q0I,!XI Y"IZ$"He stopped having lunch because a friend was on the telephone." ["He stopped to have lunch"#C&"&"GN# I,$ W0F2!(After playing football for two hours he stopped to have lunch$(#  :3+#D!8#3Z I,$ %"#&\5Y 9"/I shall now stop to have a cup of tea$ 