Final answer:
The expression that means 'I need to' or 'I have to' in Spanish is 'Tengo que'. It is followed by a verb in its infinitive form.
Step-by-step explanation:
Tengo que is the expression that means 'I need to' or 'I have to' in Spanish. It is followed by a verb in its infinitive form. For example, 'Tengo que estudiar' means 'I need to study'. This expression is commonly used in everyday conversations and is similar to the English expressions 'I have to' or 'I must'.
Learn more about Expressions in Spanish