def getSentencesForYear(year):
    """Return list of sentences in given year.
    Each sentence is a list of words.
    Each word is a string.
    Returns a list of lists of strings."""
    sentence1 = ['this', 'is', 'one', 'sentence']
    sentence2 = ['this', 'is', 'another', 'sentence']
    sentence3 = ['and', 'yet', 'another', 'one']
    sentences = [sentence1, sentence2, sentence3]
    return sentences