If peter (come) to my place, (go) to play in the yard. if (not come) to my place, i (watch) tv. if frank’s (have) their holidays in summer, they (go) to the seaside. if they (have) their holidays in winter, they (stay) at home. if the fog (thicken), harold (put up) the tent for the night.
when i (finish) my work, (go) to the cinema. (buy) this book as soon as our (give) us some money. when we (come) to your place (show) us your present. (return) you your ring when (ask) me. (wait) for my friend until (come) from the shop. my (start) writing before the sun (rise). as soon
as you (finish) your study (present) you with a new flat.

1 phoned ( законченное действие в действие началось в и продолжается до сих пор)

2 did you buy ( действие началось и закончилось в

3 has opened (завершенное действие с результатом в настоящем) -told (действие началось и закончилось в

4 wrote ( действие началось и закончилось в

5 have known ( действие началось в и всё еще продолжается ,результат важен в настоящем) - introduced ( действие началось и закончилось в

6 gave ( законченное действие в завершенное действие с результатом в настоящем)

7 did you see -phoned ( завершённое действие  в действие, которое началось в результат важен в настоящем)

8 have you been ( действие произошло в но результат в настоящем )- went,spent ( два действия в которые произошли друг за другом)

9 was ( законченное действие в действие в но важен результат)

The website was originally named Thefacebook and was only available to Harvard students, then the registration was opened to other Boston universities and then to students of any U.S. educational institutions with an email address in the domain .edu. Since September 2006, the site has been accessible to all Internet users aged 16 and over with an e-mail address.

Facebook is among the five most visited websites in the world. As of April 2017, the network has a monthly audience of 1.968 billion people. [6] As of June 2017, the Facebook audience was 2 billion users[1] — those who visited the site at least once a month or for a specified period of time was recorded using the Like button and tracking cookies[7]. Daily active audience in March amounted to 720 million people - as recorded by the tracking network Facebook daily.