问题标题：
1.You'dbetter______(puton)yourcoat,becauseitiscoldoutside.2.Look,someboysandgirls______(sing)underthetree.3.Youdmust______(look)afteryourself.4.Theheadmaster______(ask)metohavealectureonhowtolearnEnglishwell.5.Theoldman
问题描述：
1.You'dbetter______(puton)yourcoat,becauseitiscoldoutside.
2.Look,someboysandgirls______(sing)underthetree.
3.Youdmust______(look)afteryourself.
4.Theheadmaster______(ask)metohavealectureonhowtolearnEnglishwell.
5.Theoldmanis______(leave)fortheUSAtomorrowmorning
吕学利回答：
hadbetter后加动词原形,所以是puton
Look表明时态是现在进行时,所以是singing
must后面也加动词原形look
校长以前问的,时态为一般过去时,所以是asked
leave用一般进行时态表达即将发生的事,所以是leaving
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