I enjoyed a lot (by) doing so.

[thehammer]

Hello, Do I need use 'by'? Sometimes it seems only the gerund is needed and sometimes 'by'. Could you please explain?

1- Yesterday I swam for the first time. I enjoyed a lot (by) doing so.

2- You have broken the traffic rule (by) riding the bike at overspeed.

 

[Tarheel]

Yesterday I swam for the first time. I enjoyed it a lot.

You have broken the traffic rule by driving too fast.

 

[emsr2d2]

Hello. Do I need to use 'by'? Sometimes it seems only the gerund is needed and sometimes 'by' is also needed. Could you please explain?

1- Yesterday I swam for the first time. I enjoyed a lot (by) doing so. I enjoyed it a lot.

2- You have broken the traffic rule law by riding the bike at overspeed. speeding on your bike.

 

[thehammer]

As you said, my examples are not right. Could you please provide some examples explaining the difference?

 

[Tarheel]

That's what I tried to do.

 

[emsr2d2]

That's what I did, too, @thehammer.