havehad是什么时态

　　We have had problems with the supply of raw materials to the factory.

　　我们在工厂的原料供应方面遇到过问题。

　　He seems to have had some sort of religious experience.

　　他似乎有某种宗教体验。

　　They have had a significant change in policy on paternity leave.

　　他们对男人休产假制度作出了重大改变。

　　We have had to raise our prices because of rising costs.

　　因为成本日益上涨，我们不得不提高价格。

　　In some cases people have had to wait several weeks for an appointment.

　　在某些情况下，人们必须等上好几周才能得到约见。