Duration of time: For, since, and ago. - ppt download
Grammar lesson 2 Present Perfect simple/ Past Simple Present Perfect simple/Continuous Present Perfect / Past Perfect. - ppt download
Differences Between Present Perfect Tense and Simple Past Tense - English Study Page
ESL Grammar: Introduction to Present Perfect Continuous Tense -
Present Perfect vs Past Perfect - TED IELTS
Using The Present Perfect Tense in English - ESLBUZZ
Advanced English Grammar | Present Perfect in Spoken English with Examples | English Lesson in Hindi - YouTube
Present Perfect Continuous | PDF | Perfect (Grammar) | Grammar
For / since / ago / before: when to use them - material de la siguiente asignatura English / Inglés
Present Perfect and Past Simple (I have done and I did) - ppt download
Since, for, ago - Exercise 2 - Worksheet | English Grammar
Rewrite sentences - Present Perfect Tense worksheet
Uses of For, Since and Ago - English Learn Site
Past Simple vs Present Perfect | The ESL/ABE Study Center
Present Perfect or Past Simple? - YouTube
Present perfect activity for finished/unfinished time - Eslbase.com
PAST SIMPLE OR PRESENT PERFECT - ESL worksheet by Evan82
Past simple present perfect
