Do you think that adding some English words to your client's pitch helps you sell?

according market i believe that is right.

Good Day!!!

Yes it has a value addition if it is ok with the client (client also knows english)

And if you are communicating other than english.

And if your client also likes to listen in english.

Otherwise what is the fun in adding unnecessary words to lengthen the sales call?

If he doesn't understand english , it is a kind of showing off.

Depends on the clients personality and background.

YES , IT ADD UP YOUR STRENGTHS of sales call.