1. The interpretation is straightforward but the construction is not: why is 他把饭吃了 grammatical but 他把我帮了 not, despite both being SOV constructions you can make

1. The interpretation is straightforward but the construction is not: why is 他把饭吃了 grammatical but 他把我帮了 not, despite both being SOV constructions you can make SVO (他饭吃，他帮我）? 2. 走路 I agree colloquially you can say 我在走 even if it feels a bit fragmenty. I do think there’s a lot of difficulty again in the construction: He’s walking: 他在走（路） He walks quickly: 他走路很快/他走得很快 but not 他走很快 He walks to my home: 他走到我家 but not 他走路到我家 3. I guess this one depends on your view of past tense and if past perfect you consider a subset of past tense or separate: in any case 了 is not a past tense marker, since you can use it to talk about the future (e.g. 他要来了 for “he is about to arrive”) 4. I just wanted to point out that 们 is not a generic pluralizer and the generic pluralizer is usually implicit: besides, particles lie all the time in Chinese: half the words with the 纟 radical have nothing to do with silk!