Заменитель

lines = ["Look at the boy, he has a toy.",
         "Look at me.", "I am happy.",
         "Here is the kitchen where Mother cooks for me.",
         "What are little boys made of?",
         "What are little girls made of?",
         "Look at the girl, she has a doll."]
holders = {"h1": "|_ _ _ _, _ _ _ _.",
           "h2": "|_ _ _.", "h3": "|_ _ _ _ _ _?"}
for k, v in placeholder(*lines, **holders).items():
    print(k, "->", *v)

def placeholder(*args, **kwargs):
    res = {}
    for line in args:
        tmp = ''.join(map(lambda x: '|_' if x.isupper() else '_' if x.isalpha() else x, line))
        while '__' in tmp:
            tmp = tmp.replace('__', '_')
        for value in kwargs.values():
            if tmp == value:
                res[value] = res.get(value, []) + [line]
    return {k: sorted(v) for k, v in res.items()}
 
 
lines = ["Look at the boy, he has a toy.",
         "Look at me.", "I am happy.",
         "Here is the kitchen where Mother cooks for me.",
         "What are little boys made of?",
         "What are little girls made of?",
         "Look at the girl, she has a doll."]
 
holders = {"h1": "|_ _ _ _, _ _ _ _.",
           "h2": "|_ _ _.",
           "h3": "|_ _ _ _ _ _?"}
 
for k, v in placeholder(*lines, **holders).items():
    print(k, "->", *v)

from string import punctuation
 
def placeholder(*lines, **tmps):
    res = {}
    for line in lines:
        tmp = '|' + ' '.join('_'+w[-1] if w[-1] in punctuation else '_' for w in line.split())
        if tmp in tmps.values():
            res.setdefault(tmp, []).append(line)
    return {k: sorted(v) for k,v in res.items()}
 
lines = ["Look at the boy, he has a toy.",
         "Look at me.", "I am happy.",
         "Here is the kitchen where Mother cooks for me.",
         "What are little boys made of?",
         "What are little girls made of?",
         "Look at the girl, she has a doll."]
 
holders = {"h1": "|_ _ _ _, _ _ _ _.",
           "h2": "|_ _ _.",
           "h3": "|_ _ _ _ _ _?"}
 
for k, v in placeholder(*lines, **holders).items():
    print(k, "->", *v)

from string import punctuation
 
 
def placeholder(*existed_lines, **existed_holders):
    result = {}
    for line in existed_lines:
        holder = ""
        for word in line.split():
            if word[0].isupper():
                if word[-1] in punctuation:
                    holder += f"|_{word[-1]}"
                else:
                    holder += "|_ "
            elif word[-1] in punctuation:
                if word[-1] == ",":
                    holder += "_,"
                else:
                    holder += f"_{word[-1]}"
            else:
                holder += "_ "
            if holder[-1] in punctuation and holder[-1] != "." and holder[-1] != "!" and holder[-1] != "?":
                holder += " "
        if holder[-1] == " ":
            holder = holder.rstrip()
 
        if holder in existed_holders.values():
            result.setdefault(holder, []).append(line)
 
    return {existed_key: sorted(existed_value) for existed_key, existed_value in result.items()}