Connect the units
Local community
Use a question word + to-infinitive after know, learn, ask, decide: We learned how to shape clay. Do not add a second subject: not “how we to shape”. A phrasal verb has a verb and particle: find out (discover), look after (care for), pass down (transmit). Learn the whole phrase and whether an object can separate it.
City life
In double comparatives, the + comparative clause, the + comparative clause expresses linked change: The more people use buses, the less crowded the roads become. Do not use more with an -er form (“more safer”). Phrasal verbs: get around (travel), carry out (conduct), cut down on (reduce).
Healthy living for teens
In a first conditional, use if + present simple, then a modal + base verb for a possible result or advice: If you feel tired, you should take a break. Can expresses ability/permission, may possibility, must necessity and should advice. Do not normally put will in the if-clause.