- English as a Second Language (ESL)
- Modal verbs-Present-Present Perfect
- Age 12+
-
level: Pre-Intermediate
- English
Author's Instructions
Revision of obligation with must/have to-technical problems.
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Revision of for-since- Obligations
- English as a Second Language (ESL)
- Modal verbs-Present-Present Perfect
- Age 12+
- level: Pre-Intermediate
- English
Author's Instructions
Revision of obligation with must/have to-technical problems.