Compound relatives: lequel, auquel, ce dont
CEFR B2 · part 1
edumaterial's parts within the level. The European framework does not subdivide them.
The past before the past: le plus-que-parfaitForming the plus-que-parfait with the imperfect of the auxiliary, and using it for what…Negation beyond ne… pasChoosing the second half of the negation, placing it correctly with infinitives and the…Present participle, gérondif and verbal adjectiveTelling apart the three -ant forms: the gérondif with en, the present participle that…Depuis, pendant, il y a, dans, enChoosing among the five depending on whether you mean a starting point, a finished…Stressed pronouns and pronoun orderUsing moi, toi, lui, eux after prepositions, in comparisons and for emphasis; and…Accents and the cedillaPlacing é, è, ê and ç correctly, and knowing that in French an accent changes the sound…The rule, in three lines
After a preposition French does not allow que: it uses lequel, laquelle, lesquels, lesquelles. With à and de they contract: auquel, duquel. And when there is no noun to refer back to, the neutral ce qui, ce que, ce dont step in.
The usual slip. Putting que after the preposition: «la raison pour que» instead of «la raison pour laquelle».
Why it catches you out. English lets you drop the relative and strand the preposition at the end — the book I'm thinking about. French allows neither: the preposition goes first and the relative is compulsory.