No so is necessary at the beginning of the first sentence. "I concentrated on washing my shirt" sounds natural.
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HuevosThanks, Philip and Huevos.AngliholicDoes the bolded part make sense to you?What bold part?
Angliholic forgot to bold "devoted to wash my shirt." Does it make sense to you?I think Philip already addressed this for you.
Angliholic
By the way, doesn't "I concentrated myself on washing my shirt" sound good to you?
AngliholicBy the way, doesn't "I concentrated myself on washing my shirt" sound good to you?I don't know what your mother tongue is, but in English "concentrate" is not a reflexive verb.