Present Perfect употребляется со словами, выражающимиL J незаконченный период медли.Ex.

Present Perfect употребляется со словами, выражающими
L J незаконченный период времени.
Ex. 7* Say w hat you have done / havent done this w eek
(m onth, year).
to study the Present Perfect Tense,
to have business talks with the customers,
to speak with friends on the phone,
to watch some interesting programmes on TV,
to read some messages in English,
to visit some production plants outside Moscow,
to make some good contracts,
to go on business to some Russian cities,
to work on the computer very much,
to discuss a lot of business problems with the director
to see an amusing comedy,
to go to the sports centre.