Present perfect tense and uses of for and since, and used to

☆ Present perfect tense
● Pengertian
Present perfect tense merupakan suatu pola kalimat yang menerangkan kejadian atau kegiatan pada masa lampau dan pada saat speaker berbicara, kegiatan tersebut sudah di lakukan.
Rumus : subject + have/has + verb3
Have : I, you, they and we
Has : she and it

● Example using yet
Jack lost his job a year ago and has not found another job yet

● Example using just
Michael has just lost his parents

● Example using already
I have already won the math championship

☆ Uses of for and since
Penggunaan for dalam kalimat present perfect untuk menjelaskan seberapa lama sesuatu itu telah terjadi. Berikut beberapa contoh :
1. Lina has been studied for two hours.
2. My parents have been married for 25 years.

Penggunaan since dalam kalimat present perfect untuk menjelaskan sejak kapan sesuatu atau kegiatan itu telah terjadi. Berikut beberapa contoh :
1. The orphan social organization have been formed since i was born.
2. I have been lived in Tangerang since 2001.

☆ Uses of used to
Penggunaan used to dalam kalimat present perfect untuk menjelaskan sesuatu kegiatan yang pernah di lakukan di masa lampau tetapi sudah tidak di lakukan pada saat ini. Berikut beberapa contoh :
1. David used to smoke 30 cigarettes a day but now he stops.
2. My family used to live in a small village but now we live in a big city.