
1)并列谓语的时态一致。
【例如】YesterdayIwentshopping,boughtsomebooksandhaddinneratagoodrestaurant.
Thesoldierlookedathim,exchangedglanceswithhiscomradeandtookoutthegun.
2)主从复合句的时态一致。
a)主句为现在时、将来时、现在完成时,宾语从句谓语动词时态按情况而定。
【例如】
Iwonderwhatwillhappentomorrow.
Iwonderwhathappenedtohimyesterday.
Iwonderwhatishappeningnowoutside.
b)主句为过去时态,宾语从句一般用过去时态。如果宾语从句说明的是客观真理,用一般现在时。
【例如】
Hetoldmehemadeabigmistake.
HetoldmehewouldgotoBeijingthenextday.
Hetoldhehadfinishedhistask.
Theteachertoldstudentsthattheearthmovesaroundthesun.(客观真理)
3)定语从句和比较状语从句时态不受主句影响。
【例如】
Theuniversityswheresheisstudyingwasfoundedin1950.
YounowspeakEnglishbetterthanyouspokeitlastyear.
4)时间和条件状语从句中,常用现在时表示将来。
【例如】
Wewillcancelourtripifitrainstomorrow.
IwillgotovisittheSummerPalaceassoonasIarriveinBeijing.