Hi all,<br/><br/>I know we shouldnt add "in" before "this sunday", for example<br/>so,<br/>I will study this sunday.<br/><br/>But do we need to add "in" before "this summer", "this semester"...?<br/>Like,<br/>1. We will go to Japan this summer<br/>2. We will go to Japan in this summer<br/><br/>1. We study together this semester<br/>2. We study together in this semester<br/><br/>Thanks !!!