I need help taking a list that could be $1000$ characters long or more, up to n$.$

For example $[\text{'}$the$\text{'},$ 'this', 'john', 'jake', 'apple', 'orange', 'grapes', 'rake', 'car', 'bike', 'lawn', 'state', 'fork', 'spoon', 'insurance', 'agent', 'university', $\text{'}\text{'}$forward$\text{'},$ 'ahead', 'support', 'education', 'always', 'stay', $\text{'}$go$\text{'},$ 'truck', 'tips', 'there', 'decisive'$]$

With this list, i need help creating a function that takes in n which can be any number and display a list that displays a tuple of words prior to that word.

That is$,$ if i display n $=5$ and a word 'ahead', i would expect to see

$(\text{'}$spoon$\text{'},$ 'insurance', 'agent', 'university', 'forwaord'$).$

If the word 'ahead' appears more than once, it will look for that word and display the previous n words as a tuple