up to present 用什么时态?

up to present 用什么时态? 句中出现up to now用什么时态? up to the present 英语作文题目是giving a present to my mother 用什么时态写好 at any time up to the present什么意思 till now ,up to now,so far一样吗 用在什么时态? in the present和to the present 的区别在用英文表示时态的过程中·~ 语法有无错?Up to the present,the scientists have been c时态有这样的挖、错的话帮忙改一下 _____he____(finish) his work today?Not yet用什么时态present perfect tense? at the moment , at that moment ,at present各用什么时态? up to present?还是up to the present?有一个是错的吗???为啥?? i have to ting him up first.can you wait a few minutes?it____long.用什么时态 When did you (wake) up this morningwake用什么时态 to+动词什么时态 all the time用什么时态与at present连用The price of things------(increase) all the time at present.is increasing为什么? she said she want to be a teacher when she --upshe said she want to be a teacher when she --（grow）up用什么时态 up to the present day,kanas lake ______(visit)by billion of people空格应该填什么形式 up to present?还是up to the present?有一个是错的吗?为啥?up to present?还是up to the present?有一个是错的吗?为啥?