pear tree has no fruit

My Pear tree which I have for 2 years has not borne any fruit, when should I expect pear to fruit? There are alot of branches and leavesAlso I have another dual pear tree, one section has leaves but the other section seems to have died, what would cause thisMy apple trees this year, some have fruit which are not great and my other tree lost their leaves and did not bear any fruit, is the weather too wet??