Please tell which sentence is correct. I don't know if I am right or not when I use if clause.<br/><br/><u>The original sentence</u>:<br/><br/><b>"He is so lazy. He can fail the final exam</b>."<br/><br/><u>If clause</u>:<br/><br/>1. If he isn't so lazy, he can't fail the final exam.<br/><br/>2. If he wasn't so lazy, he couldn't fail the final exam.<br/><br/>Thanks.