Hi linhnmpt, "They have too small a house" = "They have a house that is too small" You can use this pattern: too + adjective + a + noun - too big a problem to solve = a problem that is too big to solve - too hard a question to answer = a question that is too hard to answer By the way, the word "wish" is used incorrectly in the first part of your sentence. It should use "hope" instead: - I hope your parents invite us for a holiday.
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