def add_word_continuation_tags(tags):
    """In place, add a continutation tag to each word:
    <cc/> -word continues current dialogue act and the next word will also
           continue it
    <ct/> -word continues current dialogue act and is the last word of it
    <tc/> -word starts this dialogue act tag and the next word continues it
    <tt/> -word starts and ends dialogue act (single word dialogue act)
    """
    tags = list(tags)
    for i in range(0, len(tags)):
        if i == 0:
            tags[i] = tags[i] + "<t"
        else:
            tags[i] = tags[i] + "<c"
        if i == len(tags)-1:
            tags[i] = tags[i] + "t/>"
        else:
            tags[i] = tags[i] + "c/>"
    return tags