change into neg (-) and inter (?) from:<br />1. we are going to visit the citadel next sunday<br />(-)<br />(?)<br />2. tom goes to the library every friday.<br />(-)<br />(?)<br />3. we have been here since 6 o&#039;clock.<br /><br />(-)<br /><br />(?)<br />4. the children are playing in the yard.<br />(-)<br /><br />(?)