5.
1 How did you spend Christmas last year?
2 Who(m) did your mother invite to your Christmas party? (Past Simple)
(Возможны и другие варианты, поскольку нету временных рамок и в задании не указанны временные формы:
Who(m) will your mother invite to your Christmas party? - Future Simple;
Who(m) has your mother invited to your Christmas party? - Present Perfect)
3 Our relatives will come to see us next month.
5.
1 How did you spend Christmas last year?
2 Who(m) did your mother invite to your Christmas party? (Past Simple)
(Возможны и другие варианты, поскольку нету временных рамок и в задании не указанны временные формы:
Who(m) will your mother invite to your Christmas party? - Future Simple;
Who(m) has your mother invited to your Christmas party? - Present Perfect)
3 Our relatives will come to see us next month.