It is raining, it has rained, it rained, it will rain
he is having, he has had, he had, he will have
he is buying, he has bought, he bought, he will buy
she is teaching, she has teached, she teached, she will teach
they are meeting, they have met, they met, they will meet
he is reading, he has read, he read, he will read
i am wanting, i have wanted, i wanted, i will want
she is visiting, she has visited, she visited, she will visit