"all" be followed by "this" or "these" ?
It depends:
- Who did all THIS work? ("Work" is a mass noun that is often treated as a singular noun.)
- Who made all THIS food? ("Food" is a mass noun that is often treated as a singular noun.)
- Who wrote all THESE essays? ("Essays" is plural.)
- Who drew all THESE comics? ("Comics" is plural.)
- Who did all THIS work? ("Work" is a mass noun that is often treated as a singular noun.)
- Who made all THIS food? ("Food" is a mass noun that is often treated as a singular noun.)
- Who wrote all THESE essays? ("Essays" is plural.)
- Who drew all THESE comics? ("Comics" is plural.)