Answer
Dear Beth ,
We (1) have been (be) in Ireland since Saturday and we're having a great time! Yesterday morning we (2) went (go) to Blarney Castle and l (3) kissed (kiss) the Blarney Stone! In the afternoon we (4) had (have) a picnic in the countryside. The weather isn't good-it (5) has rained (rain) four times since we (6) arrived (arrive)
Love Katie
PS. I (7) saw (see) a rainbow yesterday, but (8) didn't catch(not catch) a leprechaun yet!
Step-by-step explanation
According to this question, you have to use past simple and present perfect form.
The structure of the past simple tense is,
Subject + verb ( past form) + Object
In the same way, the structure of the present perfect tense is,
Subject + have/ has + Verb ( past participle) + Object
Hope this helps you.
Let me know if you have any other questions :-)