1. Don't just sit there! You should ____ (help) John with the work. helping be helping have helped
2. I want to meet him at the mall. When will he ____ (arrive)? have arrived arrived be arriving
3. I may ____ (go) to try something on in the fitting room. have gone be going going
4. You really must ____ (leave) now, or you won't make it to the store before it closes. be leaving is leaving be leaves
5. How long will they ____ (work) at the store? have working be working are working
Unit 27