Occasionally Word guesses wrong about whether you want an opening or closing
quote. When this happens, you can force it to use the one you want, using
these shortcuts:
Ctrl+', ' = apostrophe or closing single quote (that is, press the Ctrl and
apostrophe keys simultaneously, release, and then press apostrophe again)
Ctrl+`, ` = opening single quote
Ctrl+', " = closing double quote
Ctrl+`, " = closing double quote
The ` is the key usually at the top left corner of the keyboard.
Another approach is to insert a space before or after the quote as needed to
make Word use the right kind, then delete the space.