to be (am, is, are)
takhtesefid.org/watch?v=135378073374
takhtesefid.org/watch?v=352008025783
زمان حال ساده
takhtesefid.org/watch?v=181753632079
takhtesefid.org/watch?v=445403754914
حال استمراری
http://takhtesefid.org/watch?v=204174326679
http://takhtesefid.org/watch?v=245070293413