This is the way for you of how to be good in grammar. Study the basic then master it. In this site, you can easily know how to distinguish the simple past with the present tense. Good luck. GBU.

1. Simple Past Vs Present
Perfect Tense
CREATED AND DESIGNED BY
NURUL SYAWALLINA

2. In this section, you will learn how to
differenciate Simple Past with Present
Perfect
 First, determine the correct Adverbs of time

4.  Second, recognise the focus of both tenses.

5.  Finally, distinguish the uses of simple past and present perfect.

6. In Present Perfect Tense

7.  The difference between ‘For’ and ‘Since’

8. Examples (uses ‘For’ and ‘Since’)
‘For’ ‘Since’
 I have danced since I was small.
 I've lost so much flexibility since I
injured my leg.
 They have all improved in attitude
since the headmaster talked to
them.
 I haven't eaten that much since
Christmas
 I haven't been on holiday since
last year.
 I have lived in London for six
months.
 She hasn't had a day off for three
months.
 Wars have been happening for
centuries, it won’t ever change.
 I haven't been on holiday for ages.
 I haven't smoked for weeks.