1)<br/><br/>a)Let's not do anything.<br/><br/>b)Let's don't do anything.<br/><br/>2)<br/><br/>a)These lines are crossed.<br/><br/>b)These lines are cross.<br/><br/>Thanks <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' alt='Emotion: smile'/>