结构：结构：①主语+be动词(am/is/are);②主语+动词原形/动词单三形式
使用语境：客观事实和真理，现在情况经常性；或条件、时间状语从句中主将从现
标志词:often,usually,always,sometimes,every day,once a month等。并列句：and前后时态一致
1.The Netherlands needs thousands of new houses because the country _______ (have) a growing population.
2.There ________ (be) six people in my family.
3.He ______(go) for a walk alone last term, but now he often______(do) with his parents .
4.She ________ (like) dancing and usually goes to dance classes on weekends.
