The travel unit begins. First stop: means of transport and the verbs to use them. With the instrumental -z that you already know from A1, saying “by train” or “by bike” is just a suffix.
The means
English
Basque
”By…” (instrumental)
The train
trena
trenez
The bus
autobusa
autobusez
The plane
hegazkina
hegazkinez
The boat
itsasontzia
itsasontziz
The car
kotxea / autoa
kotxez / autoz
The bicycle
bizikleta
bizikletaz
On foot
—
oinez
The places
English
Basque
The station (train/bus)
(tren-/autobus-)geltokia
The airport
aireportua
The port
portua
The taxi stand
taxi-geltokia
The road
errepidea
Travel verbs
Trena hartu dut. — I’ve taken the train.
Autobusa galdu dugu! — We’ve missed the bus!
Hegazkina berandu atera da. — The plane has left late.
Trena Gasteizen gelditzen da. — The train stops in Vitoria.
Bidaiariak trenera igo dira. — The passengers have gotten on the train.
Donostian jaitsiko gara. — We will get off in Donostia.
Igo (to get on/go up) and jaitsi (to get off/go down) are the key pair: trenera igo (to get on the train), trenetik jaitsi (to get off the train). Notice the cases: -ra to get ON, -tik to get OFF.
How do you go?
— Nola joaten zara lanera?
— Normalean autobusez, baina eguraldi ona badago, bizikletaz edo oinez. Eta zu?
— Ni trenez. Etxetik geltokira bost minutu ditut oinez.
Note: in the Basque Country, the local commuter train has always been the topoa (the “mole”, between Donostia and Hendaia, because it goes underground) and Euskotren connects the coast. If you hear «topoa hartuko dugu», you know what it means: the little green train.