1. I could hold a big party due to my Mom 's help
Had it .....not been for Mom's help, I couldn't have held a big party.............
2. Fiona was so disappointed that she could not keep ob working
Such... was the disappointment that Fiona could not keep on working........
3. Although Robbert is competent in his work ,he does not know how to deal with this client
Competent.... is Robbert in his work, he still doesn't know how to deal with this client...........