1. will, be going to, (except not formal in tone, but a literal match for meaning) shall, is to; (in the past tense "skulle") were to; was to (Usually not sensible translations, but will provide the right intuition in some tricky cases – see below.)
3. would (Compare "were to" for the connection, like in "If I were to / would do it" and "They determined that cutbacks were to / would have serious consequences." Compare also old-fashioned English like "If it rains, I should [would] stay home." The more common sense of "should" makes things tricky.)