Table: english_heirs
Columns: heir
status
relationship_to_monarch
became_heir
reason
ceased_to_be_heir
monarch

Question: Who is the Monarch whose Heir is Robert Curthose when the Reason is that the father became king?
SQL: SELECT "monarch" FROM english_heirs WHERE "heir" = 'robert curthose' AND "reason" = 'father became king'

Question: Which Monarch has succession unclear 1100-1103 as his Status?
SQL: SELECT "monarch" FROM english_heirs WHERE "status" = 'succession unclear 1100-1103'

Question: Which Reason is given when 1103 is the date for Became heir?
SQL: SELECT "reason" FROM english_heirs WHERE "became_heir" = '1103'

Question: What is the Status when Henry I is the Monarch and the Reason is succession unclear 1100-1103?
SQL: SELECT "status" FROM english_heirs WHERE "monarch" = 'henry i' AND "reason" = 'succession unclear 1100-1103'