Suppose a foreign friend of yours has written to inquire about the possibility of making a seven-day...

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any a several more than

to play with playing with to play plays

and but or so

in on at from

drive are driving drove were driving

drive are driving have driven were driving

drive are driving have driven were driving

drive are driving drove were driving

you just talked whom you just talked to who you just talked to him which you just talked to

had driven are driving drove were driving

any a several more than

drive are driving drove were driving

report reply communicate answer

Yo/△-11；Y/Y-12；Y/△-11 Yo/△-11；Y/Yo-12；Y/△-11 Y/△-11；Yo/Y-12；Y/Y-12 Y/△-11；Y/Y-12；Y/Yo-12

Δ/Δ Yo/Yo Yo/Δ Δ/Yo

Y 侧故障相电流等于 Yo 侧故障相电流 Y 侧故障相电流等于 Yo 侧故障相电流的 2/3 Y 侧非故障相电流等于 Yo 侧故障相电流的 1/3 Y 侧故障相电流等于 Yo 侧故障相电流的 3/2

but and or so

you just talked whom you just talked to who you just talked to him which you just talked to

Yo/△-11；Y/Y-12；Y/△-11 Yo/△-11;Y/Yo-12;Y/ △-11 Y/△一ll;Yo/Y-12;Y/Y-12 Y/△-11;Y/Y-12;Y/Yo-12