When you use cut and paste in a Word document, Word takes care of adding the correct spacing–that is, if you have the Smart Cut And Paste option selected.

Run Word and choose Tools, Options. When the Options dialog box opens, click the Edit tab. Now, select the Use Smart Cut And Paste check box and click OK to close the dialog box and record your new setting.

With Smart Cut And Paste enabled, you can paste a word right next to another and Word adds a space for you. Also, if you insert a word before a period, Word makes sure there’s no space between the end of the pasted word and the period.