*For:*
1. Incorrect: "I'm waiting for you since 2 hours."
Correct: "I've been waiting for you for 2 hours."
2. Incorrect: "I'm studying here for three months now."
Correct: "I've been studying here for three months."
*From:*
1. Incorrect: "I'm working here from Monday."
Correct: "I start working here from Monday."
2. Incorrect: "I'm living in NYC from 5 years."
Correct: "I've been living in NYC for 5 years."
*Since:*
1. Incorrect: "I'm studying English since 2018."
Correct: "I've been studying English since 2018."
2. Incorrect: "I'm waiting for you since morning."
Correct: "I've been waiting for you since morning."
*Key differences:*
1. "For" indicates duration (e.g., "I'll be there for 2 hours").
2. "From" indicates starting point (e.g., "I'll work from 9 am").
3. "Since" indicates starting point in the past (e.g., "I've worked here since 2018").
*Tips:*
1. Use "for" with durations (e.g., "2 hours," "3 months").
2. Use "from" with starting points (e.g., "Monday," "9 am").
3. Use "since" with past starting points (e.g., "2018," "morning").
Common errors include:
- Confusing "for" and "since"
- Omitting auxiliary verbs (e.g., "I've been")
- Incorrect tense usage
Do you have specific questions or examples?
