Prepositions

Question 1

When does penser need à or de?

Answer 1

Penser + inf does not need an à or de

To think about is penser à and to abbreviate it use j’y pense

To say to think of is penser de, however this is most used in a question or a response. To abbreviate use j’en pense (it is about)

Question 2

Should ‘lontemps’ be followed be a preposition or not?

Answer 2

Verb + longtemps does not need a preposition