Question

If he ... ... (have not have) problems last week, he (may be talk) to us now.

Answer 1

If he had not had problems last week, he might be talk to us now.
(Second Conditional). Построение: if+Past Simple вторая часть he/she/you/they/we...+would/could/might

Answer 2

1 часть- had to
2 часть - might be