Carcassonne Big Box 6

Yes — every edge of a newly placed tile must match the terrain (road, city, or field) of every adjacent tile; you may not leave mismatched edges (Rulebook, p.3).

No — you may only place a meeple on a feature if that specific connected feature has no meeple of any player; separate, unconnected features are allowed (Rulebook, p.3–4).

Score and return meeples immediately when a feature is completed: roads and cities are scored at the moment they are closed, and monasteries when fully surrounded by tiles (Rulebook, p.3–5).

Farmers are scored only at game end: each completed city touching a farmer’s field scores the farmer points as described in final scoring (Rulebook, p.6).

If a road with an Inn or a city with a Cathedral is not completed by game end it scores zero points instead of partial points; when completed normally they simply increase the feature’s value (Expansion "Inns & Cathedrals", p.2).

When you have the builder in a road or city and you place a tile that extends that same feature, you immediately get to draw and place one more tile (the builder’s extra turn) before play passes (Expansion "Traders & Builders", p.3–4).