Здравствуйте попогите пожалуйста определите видовременную форму сказуемых?

1.Nowadays worldwide trade is made immeasurably easier.
2.The currency in Italy and Turkey was called lira.
3.Currencies are used to buy goods and services, and their value is deter¬mined in many ways.
4.It used to be that a currency's value was fixed by its government or was linked to some item of value.
5.The problem is being discussed at the moment.
6.The letter has been posted.