мне нужно точные маркеры! к примеру в Present Simple  маркер времени: every sumeer!!  

Present simple

Always,often,seldom,every day,usually,sometimes,once a week,every summer,at weekend,from timebto time,every September,on Mondays

Past simple

Yesterday,2days ago,last year,the day before yesterday,the other day,in May,in 2003,on Monday

Future simple

Tomorrow,next week,soon,in 2days,the day after tomorrow,someday

Present continuous

Now,at the moment,at this time,this week

Past continuous

Yesterday at 5 o'clock

Yesterday when she came

While, this time last year,from 5 a..m. to 5p.m.

Future continuous

Tomorrow at 5 o'clock

Tomorrow at this time

This time next week

Present Perfect

Ever,never,since 2007,lately,for 2years,just,yet,already,recently,sofar=upto now

Past Perfect

By the time he come

Yesterday by that time

Future Perfect

Tomorrow by 5 o'clock

Tomorrow by this time

By the end of this week

Present Perfect continuous

Since 2003,for 3 years.How long....?