Are these sentences correct:<br/><span style="color:#ff0000;">1-I am nervous to tell a joke.</span><br/><span style="color:#ff0000;">2-I am nervous about telling a joke.</span><br/><br/><span style="color:#ff0000;">3-I am nervous to meet your parents.</span><br/><span style="color:#ff0000;">4-I am nervous about meeting your parents.</span><br/><br/>Is there a difference between the meanings of 1 and 2, and is there one between the meanings of 3 and 4?<br/><br/>Gratefully,<br/>Navi.